Resource Type: Manuals, Policies, Guidelines, and Handbooks, etc.
This guideline covers various types of positive protection devices that can be easily placed and moved for short duration and short term work operations, especially compared with traditional portable …MoreTruck-Mounted Attenuators
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Requirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
Caltran's policy for maintenance operations is as follows: When closing a lane, a barrier vehicle or a shadow vehicle shall be used for the installation of the signs and the FAS if they can be placed … More
A Driving Simulator Study: Evaluation of Vehicle Mounted Attenuator Markings in Work Zones During Different Times of the Day (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
This report presents a study of driver perceptions using a driving simulator. The evaluation required one hundred and twenty participants from different age groups to drive through virtual highway wor…MoreRequirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
Minnesota DOT does not require the use of truck-mounted attenuator (TMA) equipped vehicles for the installation of temporary traffic control devices. However, Mn/DOT sometimes uses mobile lane closure… More
Analysis of Expected Crash Reduction Benefits and Costs of Truck-Mounted Attenuator Use in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
A truck-mounted attenuator (TMA) is a device that attaches to the back of a work truck to help protect work crews and the traveling public from the severe consequences of rear-end crashes between moto…MoreDevelopment of a 100 km/h Reusable High Molecular Weight/High Density Polyethylene Truck Mounted Attenuator (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
This paper describes the development and full-scale crash testing of a reusable truck mounted attenuator that dissipates kinetic energy through the lateral deformation of a nested cluster of high mole…MoreRequirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
Illinois requires that work zone lane closures be set up in the direction of traffic flow. Vehicles used in this process may work out of the closed lane. Work zone take-down is done in the reverse dir… More
Iowa DOT Using Audible Attenuators to Increase Short-Term Work Zone Awareness (Publication)
Resource Type: News and Other Non-research Articles
The Iowa Department of Transportation is employing a number of safety practices including the use of audible attenuators on short-term, stationary, or slow-moving maintenance operations. The attenuato…MoreRequirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
Michigan does not require the work vehicle to have a TMA. It does not require truck-mounted attenuators (TMAs) or a shadow vehicle to be used when setting up a lane closure. In its TMA guidelines, Mic… More
Younger Driver’s Evaluation of Vehicle Mounted Attenuator Markings in Work Zones Using a Driving Simulator (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
This paper evaluates the effectiveness of four vehicle mounted attenuator (VMA) markings used by the Departments of Transportation (DOTs) in work zones. A driving simulator was used to evaluate the pe…MoreRequirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
When a shadow vehicle is used, TxDOT requires the vehicle to be equipped with a truck-mounted attenuator. Shadow vehicles are required in many situations including mobile operations and short-term fre… More
Portable Positive Protection: A Guide for Short Duration and Short Term Work Zones
September 2015
PDF Version [3.8 MB]
Developed by ATSSA for the FHWA Work Zone Safety Grant Program
Note: This document cites specific products solely to illustrate the concept of portable… More
Requirements for work or shadow vehicles to have Truck-Mounted Attenuator (TMA) (Practice)
New Hampshire does not require a truck-mounted attenuator (TMA) to protect workers or work vehicles during lane closure set-ups and removals. NHDOT has included some TMA requirements in project-specif… More
Safety Analysis of Truck Mounted Attenuators in Mobile Work Zones Using Differential Analysis (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
While talking about road maintenance and safety in mobile work zones, it is unavoidable to not talk about truck mounted attenuators (TMAs). TMAs are eminent in work zones as they are mainly inte…MorePortable Positive Protection: A Guide for Short Duration and Short Term Work Zones (Publication)
Resource Type: Manuals, Policies, Guidelines, and Handbooks, etc.
This guideline covers various types of positive protection devices that can be easily placed and moved for short duration and short term work operations, especially compared with traditional portable …MoreColorado DOT and Partners to Unveil Self-Driving Work Zone Vehicle (Publication)
Resource Type: News and Other Non-research Articles
Royal Truck & Equipment, a US manufacturer of truck mounted attenuator (TMA) trucks, is to unveil the Colorado Department of Transportation autonomous attenuator truck, along with partners at Co…MoreCDOT Tests Self-Driving Work Zone Vehicle: Video (Publication)
Resource Type: News and Other Non-research Articles
The Colorado Department of Transportation (CDOT) unveiled its Autonomous Impact Protection Vehicle (AIPV), a driverless crash cushion truck designed to advance safety for roadway maintenance crews. CD…MoreImproving the Process for Providing Mobility and Safety in Work Zones: 2008 Summary Report (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Minnesota Department of Transportation (MnDOT) conducted a review of their “Process for Providing Mobility and Safety in Work Zones.” The review meetings provided an opportunity for districts to f…MoreCDOT Purchases the World’s First Automated Self-Driving Construction Vehicle (Publication)
Resource Type: News and Other Non-research Articles
When Robert Roy was helping to create the world's first self-driving construction truck, he traveled across the country and talked to people in the construction industry. He learned that drivers of cr…MoreComparison of Three Traffic Management Plans Showing Shadow and Police Vehicle Effects on Driver Behavior at Highway Single Lane Closures (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Lane closures on multi-lane roads require drivers to transition safely to an open lane before passing the worksite. To reduce worker and driver injury risk, truck-mounted attenuators (TMAs) are often …MoreShadow Vehicles for Work Zones Training Module (Training)
This training module provides criteria for the use of shadow vehicles and Truck Mounted Attenuators (TMAs) in work zones. Module materials are based on the product "Field Guide for the Use and Placeme… More
Best Practices for Maximizing Driver Attention to Work Zone Warning Signs (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Studies have shown that rear-end crashes in the advance warning area for a work zone are the most common type of work zone crashes. Driver inattention (or distraction) is reported as the most commo…MoreEvaluation of Innovative Traffic Safety Devices at Short-Term Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The objective of this study was to investigate and evaluate the usage and effectiveness of innovative traffic control devices that can be used in short-term work zones. Any device to be used in short-…MoreCan Self-Driving Equipment Make Work Zones Safer? (Publication)
Resource Type: News and Other Non-research Articles
Warning signs, barriers, and truck-mounted attenuators (TMA) can reduce some of the risks workers face in highway work zones, but they cannot eliminate the hazards. This past summer, Colorado Depar…MoreWork Zone Crashes Climb During Pandemic, Even as Traffic Ebbs (Publication)
Resource Type: News and Other Non-research Articles
Work zone crashes and fatalities have increased in some states during the COVID-19 pandemic, despite the drop in traffic. Highway workers are at more risk than ever as distracted drivers speed through…MoreGPFD Launches First Fire Truck-Mounted Attenuator Program in the United States (Publication)
Resource Type: News and Other Non-research Articles
In response to the growing number of highway incidents involving first responders, the Grand Prairie Fire Department (GPFD) has launched the first fire truck-mounted attenuator program in the United S…MoreFunctional Requirements for Highly Portable Positive Protection Technologies in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Many work zone devices, such as truck-mounted attenuators, cones, and barrels, are used to separate workers from the traveling public during construction and maintenance activities. However, these dev…More