scholarly journals Work Zone Crashes Involving Traffic Control Devices, Safety Features, and Work Vehicles and Equipment

2007 ◽  
Vol 2015 (1) ◽  
pp. 64-70
Author(s):  
James E. Bryden
Keyword(s):  
Traffic Control ◽  
Work Zone ◽  
Control Devices ◽  
Traffic Control Devices ◽  
Safety Features

Work Zone Traffic Accidents Involving Traffic Control Devices, Safety Features, and Construction Operations

1998 ◽  
Vol 1650 (1) ◽  
pp. 71-81 ◽  
Author(s):  
James E. Bryden ◽  
Laurel B. Andrew ◽  
Jan S. Fortuniewicz
Keyword(s):  
New York ◽  
Traffic Control ◽  
Construction Projects ◽  
Traffic Accidents ◽  
New York State ◽  
Work Zone ◽  
York State Department ◽  
Control Devices ◽  
Traffic Control Devices ◽  
Safety Features

There were 496 work zone traffic accidents on New York State Department of Transportation construction projects from 1994 through 1996. These accidents involved impacts with work zone traffic control devices and safety features; construction features, such as pavement bumps and joints; drainage features; excavations and materials; and construction vehicles, equipment, and workers. These items, which include all of the features introduced into the roadway environment by construction activity, represent one-third of all work zone accidents and 37 percent of those involving serious injury. Channelizing devices, arrow panels, signs, and other traffic control devices generally resulted in little harm when impacted. Impact attenuators, both fixed and truck mounted, also performed well. Although portable concrete barriers prevent vehicle intrusions, impacts with barrier are severe events. Barriers must be properly designed and limited to only those locations where they are needed to protect more serious hazards. Construction vehicles, equipment, and workers were involved in over 20 percent of all work zone accidents, resulting in serious injuries. Although intrusions by private vehicles into work spaces are a serious concern, construction vehicles, equipment, and workers in open travel lanes are also a serious concern. Good design of work zone traffic control plans, combined with adequate training and supervision of workers, is essential to control both concerns.

Crash Testing and Evaluation of Work Zone Traffic Control Devices

1998 ◽  
Vol 1650 (1) ◽  
pp. 45-54 ◽  
Author(s):  
King K. Mak ◽  
Roger P. Bligh ◽  
Lewis R. Rhodes
Keyword(s):  
Traffic Control ◽  
Evaluation Criteria ◽  
Work Zone ◽  
Work Zones ◽  
Impact Performance ◽  
Crash Testing ◽  
Control Devices ◽  
Traffic Control Devices ◽  
Under Construction ◽  
The Impact

Safety of work zones is a major area of concern since it is not always possible to maintain a level of safety comparable to that of a normal highway not under construction. Proper traffic control is critical to the safety of work zones. However, traffic control devices themselves may pose a safety hazard when impacted by errant vehicles. The impact performance of many work zone traffic control devices is mostly unknown, and little, if any, crash testing has been conducted in accordance with guidelines set forth in NCHRP Report 350. The Texas Department of Transportation (TxDOT) has, in recent years, sponsored a number of studies at the Texas Transportation Institute to assess the impact performance of various work zone traffic control devices, including plastic drums and sign substrates, temporary and portable sign supports, plastic cones, vertical panels, and barricades. The results, findings, conclusions, and recommendations are presented for temporary and portable sign supports, plastic drums, sign substrates for use with plastic drums, traffic cones, and vertical panels, whereas those for barricades are covered elsewhere. Most of the work zone traffic control devices satisfactorily met the evaluation criteria set forth in NCHRP Report 350 and are recommended for field implementation. However, some of the devices failed to perform satisfactorily and are not recommended for field applications. The results from these studies are being incorporated into the TxDOT barricade and construction standard sheets for use in work zones.

User costs at the work zone

2001 ◽  
Vol 28 (4) ◽  
pp. 747-751 ◽  
Author(s):  
Fazil T Najafi ◽  
Roberto Soares
Keyword(s):  
Traffic Control ◽  
Technical Note ◽  
Work Zone ◽  
Highway Capacity ◽  
Highway Capacity Manual ◽  
User Costs ◽  
Delay Models ◽  
Control Devices ◽  
Traffic Control Devices

The objective of this technical note is to discuss the implications related to evaluating work zone user costs. It discusses the work zone dilemma existing among the agency, users, and contractors, and presents different strategies that have been conducted to minimize delay and maximize the number of vehicles that can travel safely throughout the work zone. It further discusses the implication of using five of the most used tools in the process of evaluating the work zone: (i) the Manual on Uniform Traffic Control Devices (MUTCD); (ii) the Highway Capacity Manual (HCM); (iii) computerized software; (iv) delay models; and (v) work zone user costs models.Key words: work zone, user costs, HCM, MUTCD, accident, delay, delay costs.

scholarly journals Crash Testing and Analysis of Work-Zone Sign Supports

2002 ◽  
Vol 1797 (1) ◽  
pp. 96-104 ◽  
Author(s):  
Karla A. Polivka ◽  
Ronald K. Faller ◽  
John R. Rohde ◽  
Dean L. Sicking
Keyword(s):  
Traffic Control ◽  
Work Zone ◽  
Work Zones ◽  
Design Elements ◽  
Impact Performance ◽  
Crash Testing ◽  
Control Devices ◽  
Traffic Control Devices ◽  
The Impact ◽  
Fundamental Design

A variety of traffic-controlling devices are used in work zones; some of these are not normally found on the roadside or in the traveled way outside of the work zones. These devices are used to enhance the safety of the work zones by controlling the traffic through these areas. Because of the placement of the traffic control devices, the devices themselves may be potentially hazardous to both workers and errant vehicles. The impact performance of many work-zone traffic control devices is mainly unknown, and to date limited crash testing has been conducted under the criteria of NCHRP Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features. The results of full-scale crash testing of flexible panel work-zone sign stands were evaluated and analyzed to quantify the features that successful devices shared, as well as common features of those devices that failed salient safety criteria. Parameters considered included sign base and upright properties, sign height, cross-member properties, and ancillary details. Results pointed to three problematic, fundamental design issues: ( a) combinations of base and upright stiffness and strength that generally lead to significant windshield damage, ( b) cross members that lead to windshield damage in the end-on (90°) impact orientation, and ( c) appurtenances that have an impact on performance. Although there are a significant number of variables that control the performance of a given device, these generalizations offer a basis for the evaluation of the fundamental design elements.

Robotic Highway Safety Markers

2002 ◽  
Author(s):  
Shane M. Farritor ◽  
Mark E. Rentschler
Keyword(s):  
Traffic Control ◽  
Highway Safety ◽  
Work Zone ◽  
Control Architecture ◽  
Replacement Cost ◽  
Marker System ◽  
Safety Devices ◽  
Work Zone Safety ◽  
Control Devices ◽  
Traffic Control Devices

Proper traffic control is critical in highway work zone safety. Traffic control devices such as signs, barricades, cones, and plastic safety barrels are often used. Accidents can occur because of improper work zone design, improper work zone housekeeping, and driver negligence. One solution is to automate safety devices. This paper presents a mobile safety barrel robot. The Robotic Safety Barrels are the first elements of a team of Robotic Safety Markers (RSM) that includes signs, cones, and possibly barricades and arrestors. To be practical the system must be reliable and have a low per robot cost. A robot that malfunctions could enter traffic and create a significant hazard. Also, multiple safety markers are used and barrels are often struck by vehicles. Safety markers with a high replacement cost are not practical. This paper describes the motivation for the robotic safety marker system and how it could improve work zone safety. The design of three robot prototypes is presented. A control architecture is discussed that has been implemented in simulation and partially tested on the prototype robots.

Crash Testing and Evaluation of Work Zone Barricades

1998 ◽  
Vol 1650 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Roger P. Bligh ◽  
King K. Mak ◽  
Lewis R. Rhodes
Keyword(s):  
Traffic Control ◽  
Work Zone ◽  
Department Of Transportation ◽  
Work Zones ◽  
Impact Performance ◽  
Crash Testing ◽  
Texas Department ◽  
Control Devices ◽  
Traffic Control Devices ◽  
The Impact

Proper traffic control and delineation are critical to achieving safety in work zones. However, the work zone traffic control devices themselves may pose a safety hazard to vehicle occupants or work crews when impacted by errant vehicles. Thus, there was a need to research the safety performance of work zone traffic control devices to ensure that they perform satisfactorily and meet NCHRP Report 350 guidelines. Several research studies sponsored by the Texas Department of Transportation evaluated the impact performance of various work zone traffic control devices, such as temporary and portable sign supports, plastic drums, sign substrates for use with plastic drums, traffic cones, and vertical panels. Specifically addressed are the studies on barricades. Standard wooden barricade construction was found to be unacceptable due to a demonstrated potential for intrusion of fractured members into the occupant compartment. In response to deficiencies identified in the wooden barricade tests, several alternate barricade designs were developed and successfully tested.

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