Roadside Design in the Future
Since the first roadways were built, highway designers have constantly been striving to ensure that motorists can travel to their destinations on safe highways. However, their efforts...
Effects of Shoulder Reductions on Highway Safety
In order to accomodate existing traffic and projected growth, it is essential that the most effective use be made of the limited right-of-way available for freeways. It is important to...
Shoulder Rumble Strips at Narrow Bridges
The highways in the United States have thousands of minimum design narrow bridges. Replacement of these bridges with current state of the art designs is not cost effective nor feasible...
Effects of Lane Width Reduction on Safety and Flow
This research dealt with the issue of lane narrowing as an alternative to pavement widening in providing safety improvements on urban freeways. This study dealt with I-95 in Miami Florida...
Selection of Performance Levels for Longitudinal Barriers
There is a demand within the highway community for multi-service level safety features, including traffic barriers. The need has become more acute in recent years as revenues decline and...
Performance of Highway Traffic Barriers
This paper describes an investigation of traffic barrier performance in New York State. A one-year sample of all traffic-barrier accidents in the state was obtained from Department of...
Transitioning End Terminal A TRENDtm for the Future
The highway engineer frequently starts from a position where an identified highway element is causing serious injuries or fatalities to motorists on the nation's highways....
End Treatments for Deep Beam Highway Guardrail
End treatments on highway guardrail serve two functions: (1) to make the end safe in case of an impact there, and (2) to provide anchorage in case of an impact adjacent to the end. Two...
Hazardous Events After Redirectional Collisions
The potential for hazardous events occurring to vehicle occupants after a redirection from a longitudinal barrier has not been adequately addressed. Very few studies are available which...
Occupant Risk in Longitudinal Barrier Collisions
The following paper presents data derived from sled test experiments, full-scale vehicle crash tests as well as an in-depth analysis of accident data which suggest that occupants are not...
Seismic Acceleration Maps for Oregon
To evaluate the seismic hazard for the Corps dams in the Portland District, operating basis earthquakes (OBE) and maximum credible earthquakes (MCE) were established for seismic zones...
Manpower Planning for Construction Administration
Manpower planning is an important aspect of any organization, but is particularly difficult in an activity subject to as many variables as highway construction. This paper outlines a process...
Traffic Barriers: A Second Chance
More motorists are killed each year after striking traffic barriers than any other fixed object except utility poles and trees. These deaths occur primarily because the guardrail or bridge...
Enhancing Highway Safety Through 3R Construction
The safety improvement programs specifically aimed at correcting high accident locations (HALs) are certainly helpful. These programs have resulted in sizeable frequency as well as severity...
Non-Freeway Programwide 3R Accident Analysis: New York
The New York Program for restoration, rehabilitation and resurfacing (3R's) has relied on broad scoped projects and case-by-case consideration of exceptions to design standards...
Assessment of Safety Impacts of Highway Projects
In this paper the safety impact of highway improvement and maintenance activities is examined in terms of accident reduction potentials of these activities. There are three causes of accident:...
RRR Design Standards: Cost-Effectiveness Issues
The Transportation Research Board study of geometric design standards for RRR projects is currently trying to match the logic of cost-effectiveness to the mostly judgmental process of...
Delineation Effectiveness for Alcohol Involved Accidents
The approach to the problem of the alcohol impaired drivers to date has been directed at driver education and increased police enforcement. A complementary and parallel approach is presented...
Sighting Safety
This paper examines the interrelation between drivers' visual needs and the road environment. Specific elements of visual limitation and drivers at greatest risk are identified....
An Analysis of Traffic Signal Safety Improvements
Identifying high accident rate locations and determining that they have an overrepresented type or pattern of accidents is an important first step in the safety improvement process. However,...
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