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Shadow Vehicles for Work Zones
Training Module
Shadow Shadow Vehicles for Vehicles for Work ZonesWork Zones
Training ModuleTraining Module
Developed By:
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About This CourseAbout This Course
This material is based upon work supported by the Federal HighwayAdministration (FHWA) under grant agreement NO. DTFH61-06-G-00004
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AlsoAlso
"Any opinions or recommendations expressed in this course are those of the instructor and do not necessarily reflect the view of the FHWA or ATSSA".
He said what?
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Learning ObjectivesLearning Objectives
Define the Different Types of Protective VehiclesDescribe Shadow Vehicles and Their Applications Define TMAIdentify the Priority for Use of a Shadow Vehicle and TMAFind Appropriate Spacing Guidelines and Determine PlacementUnderstand Appropriate Typical Applications that May Include Shadow Vehicles
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Based on FHWA Grant ProductBased on FHWA Grant Product
ATSSA developed this guide for FHWA under the Work Zone Safety Grant DTFH61-06-C-00004Course materials are based on this productThe product is based on the MUTCD and AASHTO Roadside Design Guide
“Field Guide for the Use and Placement of Shadow Vehicles
in Work Zones”
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FHWA Grant Product (cont.)FHWA Grant Product (cont.)
Provides information from MUTCD and RDG in one easy to use field manualSummarizes available guidanceAlways check your local requirements
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Three Types of Protective Vehicles
Three Types of Protective Vehicles
Shadow vehiclesBarrier vehiclesAdvance warning vehicles TMA
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What is a Shadow Vehicle?What is a Shadow Vehicle?
A stand alone truckMay be occupied and movingUsed to protect:
WorkersMotorists
See MUTCD and RDG
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Shadow Vehicles with TMAsShadow Vehicles with TMAs
Follow manufacturer’s recommendations and local agency specifications – they are based on specific criteria
Refer to Roadside Design Guide
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Truck-Mounted AttenuatorsTruck-Mounted Attenuators
Energy-absorbing devices attached to the rear of shadow trailers or trucks
The modules The modules within a TMAwithin a TMA
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Typically:Parking brake setTransmission in gearAllow for roll-ahead distance
Shadow Vehicle OperationShadow Vehicle Operation
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Shadow Vehicle Priority Guidelines
Shadow Vehicle Priority Guidelines
Based on:Facility Type (freeway/other)Activity Type (stationary/mobile)Type of Closure (lane closure/shoulder closure)
See Grant Product and RDG
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Example Priority GuidelinesExample Priority Guidelines
Very highly recommended
Very highly recommended
Exposed personnel –crack pouring, patching, utility work, striping, coning (no lane closure)
The priority for use of a TMA on the vehicle is:
The priority for use of shadow vehicles is:
If the type of activity involves:
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Shadow Vehicle LocationShadow Vehicle Location
Located in advance of the work areaShall be designed for the specific application intended
Impact speed
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Layout of Shadow VehiclesLayout of Shadow Vehicles
“The shadow truck should be positioned a sufficient distance in advance of the workers or equipment being protected….but not so much that the errant vehicle will travel around….”
“Roll-ahead distance”
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“Roll-Ahead Distance”“Roll-Ahead Distance”
The distance a TMA will displace when impactedIt depends on
Weight of TMASpeed of impactWeight of impacting vehicle
Check with the manufacturer!
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Sample TMA “Roll-Ahead Distances”for 50-55 mph Impact
Sample TMA “Roll-Ahead Distances”for 50-55 mph Impact
Weightof TMA(lbs)
Weight of Impacting Vehicle (lbs)*
4,500 10,000 15,000
10,000 (moving) 100’ 150’ 175’
15,000 (moving) 75’ 125’ 150’
10,000 (stationary) 25’ 75’ 100’
15,000 (stationary 25’ 50’ 75’
Source: Humphreys and Sullivan, “Guidelines for the Use of TMA’s”
*Mid-size auto = 2,250 lbsFull-size auto = 3,500 lbsLoaded cargo truck = 10,000 lbs
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Sample Recommended Spacing Guidelines
Sample Recommended Spacing Guidelines
100150172
Moving
74100150
Stationary
Recommended Spacing for Vehicles Weighing >22,000 lbsOperating Speed
(Traffic)
Greater than 55mph45mph to 55mphLess than 45mph
Source: AASHTO Roadside Design Guide
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Sample Recommended Spacing Guidelines
Sample Recommended Spacing Guidelines
100172222
Moving
100123172
Stationary
Recommended Spacing for Vehicles Weighing <22,000 lbs
and > 9900 lbsOperating Speed
(Traffic)
Greater than 55mph45mph to 55mphLess than 45mph
Source: AASHTO Roadside Design Guide
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SV ConsiderationsSV Considerations
Use operating speed for more conservative spacingConsider the application to determine priority for useUse will be addressed in contract documents or traffic control plansUse to protect workers during installation and removal of devices
Position SV in the Work Space Only!
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Typical ApplicationTypical Application
Mobile or Short Duration Operation on ShoulderArrow Panel Shall Be in Caution Mode
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Typical ApplicationTypical Application
Mobile Operations on a Two Lane RoadMay pull over periodically to allow traffic to pass through
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Review Learning ObjectivesReview Learning Objectives
What are the three different types of protective vehicles?What is a shadow vehicle and when might it be used? What does TMA stand for?How do we determine the priority for Use of a Shadow Vehicle and TMA?
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Review Learning Objectives (cont.)
Review Learning Objectives (cont.)
Where would use of shadow vehicles be specified?What are some typical work activities that may include shadow vehicles?