Oconto County Public Safety
Best Practices Document - Highway Incidents
DRAFT COPY
Prepared December 2007
Emergency situations are similar to work zones in that they may violate a driver’s expectations and compromise their safety in addition to the safety of crash victims, Law Enforcement, Firefighters, Public Works, and EMS personnel attending the scene. The following guideline has been developed so Oconto County has one approach to managing traffic flow and worker safety during emergencies. The guidelines include: driving to the scene, arrival at the scene, securing the scene and scene roles and responsibilities. However, some of these components have been modified for emergency situations
In addition to set-up and takedown procedures, the emergency traffic management guidelines include the rationale for the location of traffic control devices such as cones and truck-mounted warning lights and arrow boards. These guidelines for emergency traffic management are a unique application of the principles of temporary traffic control to work zone safety and represent one of most recent road safety management initiatives in the USA.
Firefighters, law enforcement officers, paramedics and other emergency service providers are highly trained professionals who are called upon to stabilize almost any situation imaginable. Upon arrival at an incident, they are required to make decisions that affect lives and/or property and the safety of everyone at the scene. They analyze the situation, identify the critical factors and act or react to them immediately. The severity or technical complexity of the incident increases the number of critical decisions that the ‘Incident Commander’ is required to resolve. Traditionally, this priority-based system has provided a level of safety at the scene by the operation of optical warning devices and the placement of vehicles. Red, amber, blue or a combination of these colors in rotating, flashing or strobe light patterns were considered sufficient to protect emergency workers and their vehicles parked randomly at the scene.
Unfortunately, the number of reported “near-miss” and “struck-by vehicle” roadway incidents are increasing along with the deaths of civilians, firefighters, law enforcement officers, paramedics and members of other agencies providing a service at the scene of these emergencies. The risks associated with working in or near this moving traffic environment must be reduced, as the current standards used by these responding agencies do not provide adequate protection to emergency workers or the public.
Traffic management has become one of the most common challenges for emergency responders as their vehicles are usually forced to obstruct or encroach into the driving lane(s) of a roadway
Response to Highway Incidents
I. Purpose: This procedure identifies parking practices for Emergency Vehicles and other vehicles that will provide maximum protection and safety for personnel operating in or near moving vehicle traffic. It also identifies several approaches for individual practices to keep personnel safe while exposed to the hazardous environment created by moving traffic.
II. Scope: It shall be the policy of the Emergency Service providers within Oconto County to position emergency vehicles at a vehicle-related incident on any street, road, highway, expressway and freeways; in a manner that best protects the incident scene and the work area. Such positioning shall afford protection to fire department personnel, law enforcement officers, EMS providers, tow service operators and the motoring public from the hazards of working in or near moving traffic.
III. Authority: In accordance with Wisconsin Statute - §349.02. In the event of fire or other emergency, law enforcement officers, sheriffs, deputy sheriffs and traffic officers and officers of the fire department may direct traffic as conditions may require notwithstanding the provisions of chs. 346 to 348 and 350.
IV. Terminology: The following terms shall be used during incident operations, post-incident analysis, and training activities related to working in or near moving traffic.
1) Advance Warning- notification procedures that advise approaching motorists to transition from normal driving status to that required by the temporary emergency traffic control measures ahead of them.
2) Block- positioning an emergency vehicle on an angle to the lanes of traffic creating a physical barrier between upstream traffic and the work area. Includes “block to the right” or “block to the left”.
3) Buffer Zone- the distance or space between personnel and vehicles in the protected work zone and nearby moving traffic.
4) Downstream- the direction that traffic is moving as it travels away from the incident scene.
5) Spotters(s)- emergency personnel assigned to monitor approaching traffic and activate an emergency signal if the actions of a motorist do not conform to established traffic control measures in place at the highway scene
6) Flaggers(s) – Personnel assigned to control stop and go of traffic or direct traffic in conformance with the manual for uniform traffic control devices.
7) Shadow- the protected work area at a vehicle-related roadway incident that is shielded by the block from apparatus and other emergency vehicles.
8) Taper- the action of merging several lanes of moving traffic into fewer moving lanes.
9) Temporary Work Zone- the physical area of a roadway within which emergency personnel perform their EMS, fire and law enforcement tasks at a vehicle-related incident.
a) Type 1 Event (Major Event): Lane closure in excess of 2 hours
b) Type 2 Event (Intermediate Event): Lane closure in excess of ½ hour
c) Type 3 Event (Minor Event): Lane closure less than ½ hour
10) Transition Zone- the lanes of a roadway within which approaching motorists change their speed and position to comply with the traffic control measures established at an incident scene.
11) Upstream- the direction that traffic is traveling from as the vehicles approach the incident scene.
12) Block to the left (right)- A maneuver designed, in the event of a collision, to force the vehicle impacting to a safe location away from the personnel on the scene. (Blocking Left means Traffic will move to the left, Blocking Right Traffic Moves to the Right)
V. Incident Response Priorities:
1) Primary Goals:
a) Priority - One: Life Safety: Initial efforts will be directed to preserving the lives of the citizens and responders. Safety will be the first priority throughout the incident
b) Priority - Two: Prevent Secondary Vehicle Crash: To minimize the risk of another motor vehicle crash involving response units and personnel, responders must properly warn approaching traffic that there is a hazard ahead, to slow down and use caution. Also, responders can position apparatus to divert traffic around the crash scene.
c) Priority - Three: Incident Stabilization: To enhance operational safety actions must be taken to prevent fire, eliminate ignition sources and stabilize the crash vehicles.
d) Priority - Four: It shall be the goal to clear the scene as soon as practical to initiate traffic flow.
2) Secondary Goals:
a) Priority - Five: Protection of the Environment: Crews working from the cold zone and with the proper personal protective equipment and training will try to contain the spilled product to the smallest area possible without exposing themselves.
b) Priority - Six: Protection of Property: Crews will attempt to protect or save property by limiting damage to vehicles to what is necessary to stabilize and remove trapped victims. Also, property salvage operations will be conducted as soon as possible.
c) Priority - Seven: Protection of Evidence: Crews will create as little impact as possible to the crash scene to help the crash investigator(s) to determine the cause and who was at fault. Responders should understand that any crash is a potential crime scene and must be treated accordingly.
d) Priority - Eight: Crash Investigation: An investigation will be conducted to determine cause, collect evidence, and to provide law enforcement. This is primarily the responsibility of Law Enforcement, but other crews can be used to assist.
e) Priority - Nine: Resource Utilization & Traffic Congestion Reduction: Any resources not needed at the scene of an emergency may be returned to staging or returned to service to minimize congestion of the highway.
f) Priority - Ten: Termination & Recovery: Resources at the scene, which are not needed, will be returned to service. Resources being staged or working at the scene will be used only as long as necessary to meet the goals of the incident action plan.
VI. Safety Benchmarks: All emergency personnel are at great risk of injury or death while operating in or near moving traffic. There are several specific tactical procedures that should be taken to protect all crewmembers and emergency service personnel at the incident scene including:
1) Never trust approaching traffic.
2) Establish an initial “block” with the first arriving emergency vehicle and redirect flow of moving traffic.
a) Always maintain an acute awareness of the high risk of working in or near moving traffic, look before you move.
b) Personnel arriving on emergency vehicles to the scene should exit the apparatus from the protected “shadow” side away from moving traffic whenever possible.
c) Officers, apparatus operators, crew members in apparatus, and all ambulance personnel must exit and enter their units with extreme caution remaining alert to moving traffic at all times, avoid turning your back to moving traffic if at all possible, and avoid exiting apparatus on the traffic side.
3) Wear a Class II or Class III-high visibility reflective vests or other protective clothing when necessary that meets the standard of the manual on uniform traffic control devices. High Visibility safety apparel shall meet standards referenced in the manual of uniform traffic control devices chapter 6E.02 (ANSI 107-1999 class two risk exposure).
4) Turn off sources of vision impairment to approaching motorists at nighttime incidents excluding vehicles emergency lights, but including vehicle headlights and spotlights.
5) Establish advance warning and adequate transition area traffic control measures upstream of incident to reduce travel speeds of approaching motorists.
6) Use traffic cones where appropriate for sustained highway incident traffic control and direction.
7) Establish a “Flagger” function to monitor approaching traffic and activate an emergency signal if the actions of a motorist do not conform to established traffic control measures in place at the highway scene.
VII. Emergency Vehicle Benchmarks: Listed below are benchmarks for Safe Parking of apparatus and emergency vehicles when operating in or near moving traffic.
1) Always position first arriving emergency vehicle to protect the scene, patients, and emergency personnel.
a) Initial fire apparatus placement should provide a protected work area from traffic approaching in at least one direction protecting personnel and emergency vehicles.
(i) Angle fire apparatus on a roadway with a “block to the left” or a “block to the right” to create a physical barrier between the crash scene and approaching traffic.
(ii) The front of the fire apparatus shall be placed slightly in the lane of traffic designated for the motorist passing the accident scene. This maneuver forces traffic to slow while passing the accident scene to protect personnel operating on the scene.
(iii) Use fire apparatus to block at least one additional traffic lane more than that already obstructed by the crashed vehicle(s).
(iv) When practical position apparatus in such a manner to protect the pump operator position from being exposed to approaching traffic.
(v) Necessary apparatus, not utilized in assisting traffic movement should be parked on the shoulder as far from the traffic lanes as possible, downstream or on the same side of the road.
2) Operating personnel, equipment, and patients should be kept within the “shadow” created by the blocking apparatus at all times.
3) When blocking with emergency vehicles to protect the emergency scene, establish a sufficient size work zone / buffer Zone. This includes:
a) All damaged vehicles
b) Roadway debris
c) Patient triage and treatment area
d) Extrication work area
e) Personnel and tool staging area
f) Ambulance-loading zone
4) Ambulance should be positioned within the protected work area with the rear patient loading door area angled away from the nearest lanes of moving traffic.
5) It may be necessary as a last resort to completely shut down traffic in the event of a vehicle extrication to establish a level of security for the personnel operating on the scene.
6) In the event an air ambulance is required to land on the roadway, traffic must be stopped in both directions with the exception of a limited access highway with a sufficient median to accommodate a 100 X 100 landing zone. (Note that Fire Service use the State MARC-2 for radio communications.)
7) At all intersections, or where the incident may be near the middle lane of the roadway, two or more sides of the incident may need to be protected.
8) Law enforcement vehicles must be strategically positioned to expand the initial safe work zone for traffic approaching from the opposing directions. The goal is to effectively block all exposed sides of the work zone. The blocking of the work zone must be prioritized from the most critical or highest traffic volume to the least critical traffic direction.
9) For first arriving engine companies where a charged hoseline may be needed, block so that the pump panel is “down stream”, on the opposite side of on-coming traffic. This will protect the pump operator.
10) Traffic cones shall be deployed from the rear of the blocking apparatus toward approaching traffic to increase the advance warning provided for approaching motorists. Cones identify and only suggest the transition and tapering actions that are required of the approaching motorist. (See Temporary Work Zone diagrams for Type I, II and III events)
a) Personnel shall place cones, and retrieve cones while facing oncoming traffic.
b) Traffic cones should be strategically placed on any roadway where emergency operations are taking place. This is to allow adequate advance warning to drivers. Cones used for controlling traffic must be consistent in construction with the manual of uniform traffic control devices section 6F.01.
VIII. Cancelled En-Route: When responding to highway emergencies and the first unit on-scene has assumed command, it will be the responsibility of the first on scene unit to assume command as the Incident Command Officer, and to evaluate all response factors before canceling any other responding units (law enforcement, ambulance or fire units). Many Fire and Ambulance Services operate with Joint Mutual Aid Agreements, were fire will assist with patent care, manpower, scene safety, and extrication operations.
If the first on scene Incident Command Officer (Law Enforcement or Fire) does not feel comfortable evaluating these response factors / making thess decisions, the officer will have the other first due responding units continue to respond. Canceling a unit en-route should only be done if the Command Officer is sure he or she has all the response factors identified; and is confident units will not be needed.
IX. Approaching and Staging
1) Emergency vehicles should attempt to reach the scene in the direction of the reported incident unless otherwise instructed by law enforcement. In some cases, the first on scene unit may advise the best access is via the access frontage or by traveling against the normal traffic flow. Emergency Vehicles should proceed in the opposite direction of normal flow only at the specific request of the first on scene Command Officer when it is assured that all traffic has been stopped. Additional responding units including Law enforcement, Ambulances and fire apparatus should confirm traffic is stopped before entering the highway against traffic. On multiple unit responses, the first unit approaching or entering the highway within a mile of the incident will report its identity, location and direction. Other units approaching will then stage Level I, preferably near an on-ramp to avoid premature commitment to the highway or access frontage. Where appropriate to do so, and within the guidelines of this policy; these apparatus may block the access road to prevent additional traffic from entering the freeway.
2) It is the responsibility of the first unit to direct other units via alternate access if unable to reach the scene. Specific directions should be given regarding approach and direction for other apparatus when problems are encountered.
X. COMMAND
1) The first unit arriving on the scene of will establish lead command of the Unified Cmd. System and establish the “Type of Event”
a) The Incident Commander shall consider the following for establishment of the incident objectives:
(i) Traffic Conditions
(a) Stopped
(b) One lane open
(c) All lanes open
(ii) Scene Assessment
(a) Medical Situation
(b) Number of patients
(c) Extrication needed
(d) Fire Conditions
(e) Haz Mat, Other
(iii) Other Resources
(a) Staging of Emergency Services
XI. Command Post Location
1) Command Post Location Should be Announced to Responding Units.
2) The Command Post location should be carefully chosen for major incidents to provide access and a good view of the scene.
3) The access frontage or an overpass provides a view of the scene for incidents on depressed roadway sections.
XII. Unified Command
1) Unified Command enables all authorities having jurisdiction and other responsible agencies to manage an incident together by establishing a common set of incident objectives and strategies.
2) The command components will include representatives from law enforcement, fire, the Highway Departments, public works, State and Tribal representation and are based on specific incident objectives and conditions.
3) It's important to physically assemble all representatives at a single location as soon as possible.
4) Once a physical location for the Command Post is determined, all agencies should advise dispatcher of that location.
5) Utilization of ICS identification vests will facilitate the Command operation and allow other agencies to find key persons at the incident.
6) Unified Command does have a lead commander. This is addressed later in the policy.
XIII. Incident Command Benchmarks: The Incident Commander must complete critical benchmarks to assure that a safe and protected work environment for emergency scene personnel is established and maintained including;
1) Assure that the first-arriving emergency vehicle operator establishes an initial block to create an initial safe work area.
2) Assign a parking location for all ambulances as well as later-arriving emergency vehicles.
a) Lanes of traffic shall be identified numerically as “Lane 1”, “Lane 2”, etc., beginning from the right to the left when right and left are considered from the approaching motorist’s point of view. Typically, vehicles travel a lower speed in the lower number lanes.
b) Directions “Right” and “Left” shall be as identified as from the approaching motorist’s point of view left or right.
c) Instruct the driver of the ambulance to “block to the right” or “block to the left” as it is parked at the scene to position the rear patient loading area away from the closest lane of moving traffic.
d) Assure that all ambulances on-scene are placed within the protected work area (shadow) of the larger apparatus.
3) Assure that all patients loading into Ambulance Units is done from within a protected work zone.
4) The initial company officer and/or Incident Commander must operate as the Scene Safety Officer until this assignment is delegated.
5) Command shall assure that traffic preemption devices (if used) are turned OFF and that other emergency lighting is appropriate for the situation.
6) Minimum size-up should include:
a) Exact Location of incident (I43 south bound right lane near ramp to 172 East)
b) Number of vehicles involved
c) Type of vehicles if different than standard auto (Semi with load etc.)
d) Number of Patients with or without injuries (follow-up additional information on patient condition conscious or unconscious)
e) Patient Entrapment (Meaning jaws or other extrication required)
f) Other Conditions such as Fire, Haz Mat Potential, Downed Wires, etc
g) Traffic Conditions (Flowing, not flowing, blocked etc.)
h) Additional dispatch requirements (what more is needed than additionally dispatched)
XIV. General Roles & Responsibilities by functional area:
1) Emergency Medical Services & Ambulance
a) Report to IC
b) Proper care and treatment of injuries of victims and responders
c) Packaging patient to move to ambulance
d) Transporting patients from scene to medical facility (Let Incident Cmd. Know you are leaving the scene and which facility the patient is being transported to)
e) Triage for multiple patient incidents if assigned by Command Officer
f) Pre-hospital treatment of responders injured on-scene
g) Maintain accountability of staff
h) Communicate with hospital, and On Scene Command Officer
i) Assign on-scene medical control if incident warrants
j) Protect crews and victims from secondary incident
2) Fire Service
a) Report to IC / Assume IC if functionally a Fire Lead Event
b) Determine safety zones
c) Communications and set up for Air Ambulance Landing Zone
d) Maintain accountability
e) Stabilize vehicle
f) Suppress fires &suppress flammable vapors (foam)
g) Fire Protection Standby during medical treatment, extrication, vehicle stabilization
h) Gain Vehicle entry
i) Cut & pry vehicle for removal of victims
j) Maintain safe access to victims
k) Assist in patient assessment
l) Protect patient(s) during cutting & prying operations
m) Provide scene lighting (when needed)
n) Assist EMS & Law Enforcement (LE) in their responsibilities when staffing permits
o) Preserve evidence
(i) Be careful when moving objects
(ii) Report evidence found
(iii) Try not to move objects or disturb scene as little as possible
p) Senior fire officer reports directly to IC, Operations Section Chief, Fire. Branch director +
q) Protect crews and victims from secondary incident
r) Evaluate for Haz Mat Situations
s) Secure vehicle prior to towing including battery isolation, fluid recovery, and cleanup of fluids (Oil Dry)
t) Reporting as required to WDNR per state requirements
3) Law Enforcement (LE)
a) Report to IC. / Assume IC If Functionally a Law Enforcement Lead Event
b) Divert or stop traffic to ensure the safety of responders and other motorists
c) Investigate crash
d) Conduct traffic control to allow continued (if not limited) traffic movement
e) Provide law enforcement
f) Collect & preserve evidence
g) Protect crews and victims from secondary incident
4) Public Works
a) Report to IC
b) Set up MUTCD compliant lane and road closures. When road closures are required, set up MUTCD compliant detour route
c) Advise regarding traffic congestion, safety concerns, need for detours, need to open lanes to relive congestion and address safety concerns, highway impediments, etc.
d) Utilize portable changeable message signs as appropriate
e) Remove traffic control at the end of the incident to resume normal traffic operations as soon as possible
5) Notes: The first emergency unit on-scene will assume command. Command may be transferred per local agreement or when it makes sense.
6) The crew-leader / Company Leader (Engine Officer, Lead EMS Staff etc.) will report as directed by the IC. It must be communicated to responding resources who, where, when and on what frequency they are to contact when arriving at the emergency.
7) The crew leader provides leadership for their crews accountability and safety.
8) The highest level trained EMS personnel on-scene will be in complete charge of the injured. If Triage Officer is established, all EMS staging and transport will be coordinated through the Triage Team Leader.
9) Command and Transfer of Lead Command
Each situation will dictate the command lead role of a scene. Below is a general “rule of thumb” relating to command.
a) All incidents will be managed through use of Unified Command as defined by NIMS.
b) Unified Command will have a lead commander based on the current incident priority.
XV. Response:
1) Only the resources assigned tasks will be at the scene.
a) Only emergency service vehicles shall be allowed at or near the crash scene. Responders must be on emergency service apparatus to respond to a motor vehicle crash. Private vehicles when necessary must be kept as far away from the crash site as possible (Down Stream / beyond the accident scene if possible).
b) Communications: Assigned radio frequencies and any other pertinent information will be transmitted to dispatch and responding crews.
c) Staging areas shall be setup as close to the operation as possible but in a safe area. Level One Staging will be defined as On Scene Staging, Level Two Staging is staging not at the event, but in a reasonable distance from the scene.
d) The IC is responsible that sufficient resources are on-scene to handle the emergency and may send extra staffing and equipment home or stop the response of resources en-route to exercise proper resource management. Resource allocation will be based on number of victims, crash severity, vehicle stability, hazardous material involvement, and other conditions warranting resources.
XVI. On-Scene:
1) Resources shall be organized consistent with ICS principles and accountability shall be maintained within the ICS system.
2) Resources will not freelance or start work at the scene unless assigned by the IC or their designated representative. All tactics will be based on the incident action plan.
a) Crews status is any of the following
(i) Staging - Immediately ready for service on apparatus
(ii) Assigned – Performing a tactic or task
(iii) Out of Service - Rehabilitation, Equipment inoperative
(iv) De-Mobilization/Released – Available for Call
XVII. Post Incident:
1) To ensure continuous improvement a critique should be held as soon as possible for Type I Incidents.
2) Where required Critical Incident Stress Debriefing (CISD) should be conducted.
3) Each Agency will debrief its own personnel, and agency leads will coordinate and critique each Lead Type 1 event with 15 days following its conclusion.
APPENDIX A
DIAGRAM
BY INCIDENT TYPES
The following pictorial representations are used with permission from www.respondersafety.com and the Cumberland Valley Volunteer Fireman’s Association (CCVFA). They are shown here to depict the possible initial placement of traffic control devices at various incident types. It is recognized, however, that not all devices shown will be carried by responding vehicles and/or personnel, and that not all scenarios will require the same type of initial response. It is further recognized that for Type I and II incidents, initial traffic control should be replaced with an appropriate road closure measure as dictated by Part VI of the MUTCD as soon as conditions allow.
TYPE I INCIDENT


TYPE II INCIDENT


TYPE III INCIDENT


APPENDIX B
STANDARD SAFETY EQUIPMENT
All traffic safety equipment used on scene for blocking or traffic control must meet the design objectives of the Uniform Traffic Safety Code. This includes Cones, Safety Vests, and Warning Lights on Vehicles.
a.
General
The function of channelizing devices is to warn and alert drivers of conditions
created by work activities in or near the traveled way, to protect workers in
the temporary traffic control zone, and to guide drivers and pedestrians safely.
Channelizing devices include but are not limited to cones, tubular markers,
vertical panels, drums, barricades, temporary raised islands, and barriers.
Devices used for channelization should provide for smooth and gradual traffic movement from one lane to another, onto a bypass or detour, or to reduce the width of the traveled way. They may also be used to separate traffic from the work space, pavement drop-offs, pedestrian paths, or opposing directions of traffic.
Channelizing devices should be constructed and ballasted to perform in a predictable manner when inadvertently struck by a vehicle. If struck, they should yield or break away, and fragments or other debris from the device should not penetrate the passenger compartment of the vehicle or be a potential hazard to workers or pedestrians in the immediate area.
Spacing of channelizing devices should not exceed a distance in feet equal to the speed when used for the taper channelization, and a distance in feet of twice the speed when used for tangent channelization.
Warning lights on channelizing devices. Consideration should be given to fog or snow areas, severe roadway curvature, and usually cluttered environments. Flashing warning lights may be placed on channelizing devices used singly or in groups to mark a spot condition. Warning lights on channelizing devices used in a series shall be steady-burn.
The retroreflective material used on channelizing devices shall have a smooth, sealed outer surface.
Channelizing devices are elements in a total system of traffic control
devices for use in temporary traffic control zones. These elements shall be
preceded by a subsystem of warning devices that are adequate in size, number,
and placement for the type of highway on which the work is to take place.
Standard designs of channelizing devices are shown in figure VI-10.
The name and telephone number of the agency, contractor, or supplier may be
shown on the non-retroreflective surface of all channelizing devices. The
letters and numbers shall be a non-retroreflective color and not over 2 inches
in height.
Particular attention should be given to assuring that channelizing devices are maintained and kept clean, visible, and properly positioned at all times. Devices shall be replaced that are damaged and have lost a significant amount of their retroreflectivity and effectiveness.
b.
Cones
(1) Cone Design
Cones shall be predominantly orange, fluorescent red-orange, orange, not less than 18 inches in height, or fluorescent yellow and shall be made of a material that can be struck without damaging vehicles on impact. Cones shall be a minimum of 28 inches in height when they are used on freeways and other high- speed highways, on all highways during nighttime, or whenever more conspicuous guidance is needed.
For nighttime use, cones shall be retroreflective or equipped with lighting
devices for maximum visibility. Retroreflection of 28-inch or larger cones shall
be provided by a white band 6 inches wide, no more than 3 to 4 inches from the
top of the cone, and an additional 4-inch-wide white band a minimum of 2 inches
below the 6-inch band.
(2) Cone Application
Traffic cones are used to channelize traffic, divide opposing traffic lanes, divide traffic lanes when two or more lanes are kept open in the same direction, and delineate short-duration maintenance and utility work.
Steps should be taken to ensure that cones will not be blown over or displaced
by wind or moving traffic. Cones can be doubled up to increase their weight.
Some cones are constructed with bases that can be filled with ballast. Others
have special weighted bases, or weights such as sandbag rings that can be
dropped over the cones and onto the base to provide added stability. Ballast,
however, should not present a hazard if the cones are inadvertently struck.
The light weight and portability of warning lights are advantages that
make these devices useful as supplements to the retroreflectorization on hazard
warning devices. The flashing lights are effective in attracting a driver's
attention and, therefore, provide an excellent means of identifying the hazard.
As used herein, warning lights are portable, lens-directed, enclosed lights
generally vehicle mounted. The color of the light emitted shall be yellow where
feasible. Apparatus used for blocking should disable red lights and utilize
only the yellow warning lights.
Studies have shown that yellow lights vs. Red or Blue Represent the best traffic warning potential; and deliver the best lighting potential (Lumens) per watt used.
Designated blocking apparatus should employ such lights, or other traffic control means such as traffic arrows etc.
Chevron Specifications are referenced in the MUTCD 2003 Edition, Revision 1, Chapter 6F.
MUTCD Chapter 6F. Temporary Traffic Control Zone Devices Standard:
Vertical panels (see Figure 6F-7, Sheet 1 of 2) shall be 200 to 300 mm (8 to 12
in) in width and at least 600 mm (24 in) in height. They shall have orange and
white diagonal stripes and be retroreflectorized.
Vertical panels shall be mounted with the top a minimum of 900 mm (36 in) above the roadway. Where the height of the vertical panel itself is 900 mm (36 in) or greater, a panel stripe width of 150 mm (6 in) shall be used.
Option:
Where the height of the vertical panel itself is less than 900 mm (36 in), a
panel stripe width of 100 mm (4 in) may be used.
Standard:
Markings for vertical panels shall be alternating orange and white
retroreflective stripes, sloping downward at an angle of 45 degrees in the
direction vehicular traffic is to pass. Vertical panels used on freeways,
expressways, and other high-speed roadways shall have a minimum of 169,000 mm2
(270 in2) retroreflective area facing vehicular traffic.
Option:
Where space is limited, vertical panels may be used to channelize vehicular
traffic, divide opposing lanes, or replace barricades.
US Fire Service chevrons / Options
The back of the apparatus shall have a barricade pattern with 6” red
stripes on a lime-yellow background. The back of the apparatus that will have
the barricade pattern shall be smooth aluminum painted red to match the vehicle.
The lime-yellow sheets go on the red painted surface, and the 6” red stripes go
over the lime-yellow.
Contact for 3M Lime-Yellow: Rollie Bible, 3M Traffic Control Materials Division,
St. Paul MN, 651-733-3590. Specs for the barricade pattern materials are as
follows.
Lime-yellow background material:"3M™ Diamond Grade™ DG3 Fluorescent
Yellow Green Sheeting 4083" (Pronounced "D-G-Cubed")
Red 6-inch diagonal stripes: Scotchlite Electronic Cutable Film – 1172 – Red.
Optional treatments for the rear barricade pattern: 1160 Protective Overlay
Film. (This is like putting Teflon over the reflective film; it makes it easier
to clean.) 880i (ink) clear edge seal.