Expert Systems for Traffic Signal Control
The level of service achieved by a pretimed signal timing control strategy implemented at an isolated intersection incurring saturated and over-saturated demand varies with actual traffic...
Expert System for Transportation Corridors
Semantic nets and frame representations are used by an expert system under development to assist in the selection of projects and control strategies in transportation corridors. The project...
Expert Systems Approach for Analysis of High Hazard Locations
This paper focuses on the detailed analysis of specific highway locations that have been identified as hazardous in the framework of a State Highway Safety Improvement Program (HSIP)....
CAD Generation of Accident Diagrams for Local Agencies
This paper reviews one such issue, safety, focusing on the development of a user-interface with a microcomputer CAD system. With this interface, the system is used to generate collision...
Use of CAD for Traffic Sign Design Purposes
At present, AutoCAD is the most popular CAD system for micromputers. It is relatively inexpensive and is very flexible, comprehensive, and easy to use. A preliminary review of AutoCAD...
Photogrammetric Analysis Using a Personal Computer
In many cases, photographs of the accident scene taken soon after the event contain visible evidence of road marks and/or debris. By the time the case reaches the accident investigator/reconstructionist,...
Public and Private Sector Strategies to Deal with Urban and Suburban Congestion
Urban transportation congestion both in the case of our cities and in many of our suburbs, has exceeded tolerable limits in many parts of the nation. Public agencies operate under very...
Microcomputer Applications in Transportation II
This book contains over 80 papers associated with the North American Conference on Microcomputers in Transportation held in Boston, Mass., from June 29-July 1, 1987. The papers address...
Costs of Truck Related Highway Damage to Alaska
The cost of pavement damage to the State of Alaska for truck traffic continues to be a very controversial topic. There is no simple answer since this cost is dependent upon pavement strength,...
Hot Sand for Improved Traction on Icy Roads
Experiments were performed to determine if heating sand prior to spreading it on icy roads would improve the skid resistance of the road more than cold sanding. Tests were made on a full-scale...
Cold Regions Features of the Whittier Access Tunnel
A feasibility study and cost estimate has been prepared for a vehicular tunnel which would form a portion of a highway between the town of Whittier, Alaska and the east side of the Kenai...
Tiedback Walls Untie Intersection
The intersection of Gallows Rd. and Arlington Blvd. in Virginia's Fairfax County required separation. Tiedback retaining walls, which required only 18 in. instead of the 18-22...
Scenic Squeeze
Constructing a four-lane dual highway through the 12 miles of Colorado's Glenwood Canyon involves several engineering innovations: cantilevered roadways, unusual retaining...
Tort Liability in the Pennsylvania Department of Transportation
During the past decade many have questioned the propriety of the doctrine of sovereign immunity; numerous legal challenges and legislative changes have eroded the doctrine in most states....
Risk Management to Reduce Highway Tort Liability
This paper identifies common risk management techniques and processes. A brief review of tort law is presented along with the specific characteristics of a highway related negligence suit....
Effective Pedestrian Safety Programs
Pedestrian fatalities account for 16 percent of all highway-related deaths and about 129,000 pedestrians are involved in accidents each year. Analyses of pedestrian accident data and determining...
Safety Impacts of Installing Pedestrian Crosswalks
At-grade pedestrian crossovers (PXO's) have been installed at about 700 locations in Metropolitan Toronto to assist pedestrians in crossing busy streets at minimal delay to...
Economic Analysis of Highway Safety Projects
The most commonly used economic analysis for highway safety projects is the cost-benefit ratio. While this is a valid analytical tool, it must be used correctly to produce valid results....
Evaluation of Safety Alternatives by Benefit/Cost Analysis
There is an increasing awareness of the need to use limited highway safety funds on projects that offer the greatest benefits. This paper describes the development and application of a...
Some Questions on the Accuracy of Safety Effectiveness Evaluations
The generally positive benefits of safety improvements, and, in particular, upgraded traffic control devices, are well-established. More difficult is the explicit rank-ordering of traffic...
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