Expert system to calculate the cofficient of friction : an approach to enhance traffic safety

Friction plays a key role in causing slipperiness as a low coefficient of friction on the road may result in slippery and hazardous conditions. Analyzing the strong relation between friction and accident risk on winter roads is a difficult task. Many weather forecasting organizations use a variety of standard and bespoke methods to predict the coefficient of friction on roads. This article proposes an approach to predict the extent of slipperiness by building and testing an expert system. It estimates the coefficient of friction on winter roads in the province of Dalarna, Sweden using the prevailing weather conditions as a basis. Weather data from the road weather information system, Sweden (RWIS) was used. The focus of the project was to use the expert system as a part of a major project in VITSA, within the domain of intelligent transport systems

Comparison between common traffic lights and three types of traffic lights with visual cycle a safety and capacity analysis

The objective of this paper is compare the common traffic lights (CTL) to three different types of traffic lights with countdown displays (SCD) and assess their effects on road safety and capacity. This comparison is required because the results found in the literature are divergent among countries and cities, and one of the SCD analyzed in our study is different from the SCD used worldwide. An observational before-after study was conducted to evaluate the safety and capacity in a period of one year before and one year after the implementation of the SCD in three Brazilian cities. The results indicate that the SCD models 1 and 3 had around 35%±14% reduction in the total number of accidents; the model 2, does not have significant reduction. In order to perform the capacity analysis a framework for data collection and an adaptation for estimation of initial lost time in each phase were developed. Considering the capacity analysis there was a reduction around 11% in the lost time in SCD model 1, 7% in SCD model 2 and 3% in SCD model 3. However the implications of this on capacity are trifle due to a small increase in the average headways for all SCD models compare to CTL.

State of Rhode Island Special Adjudication for Enforcement - volume III: analysis of the administrative adjudication of traffic offenses. Analytic study. Final report.

National Highway Traffic Safety Administration, Office of Driver and Pedestrian Programs, Washington, D.C.

Evaluation of traffic operations, safety, and positive guidance projects /

"Report no. FHWA-TO-80-1."

Safety impact of permitting right-turn-on-red: a report to Congress by the National Highway Traffic Safety Administration.

Mode of access: Internet.

Study of methods for increasing safety belt use; prepared by the Transportation Research Board, National Academy of Sciences. Comments on the study by the U.S. Department of Transportation National Highway Traffic Safety Administration.

Mode of access: Internet.

Traffic safety and health care: state and national estimates of employer costs.

Mode of access: Internet.

The drinking driver and traffic safety project. Annual report. Volume I of two volumes.

National Highway Safety Bureau, Washington, D.C.

An analysis of the impact of ASAP on the traffic safety system.

National Highway Traffic Safety Administration, Washington, D.C.

A telephone survey on alcohol and traffic safety issues relevant to evaluation of a public information campaign. Research report.

National Highway Traffic Safety Administration, Washington, D.C.

An analysis of the impact of ASAP on the traffic safety system.

National Highway Traffic Safety Administration, Washington, D.C.

Evaluation of the Alcohol Use and Traffic Safety Curriculum (K-12). Section II - volume 7a. Final report.

National Highway Traffic Safety Administration, Office of Driver and Pedestrian Programs, Washington, D.C.

An analysis of the traffic safety system. 1975. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Identification and assessment of organizations that would distribute traffic safety information to older drivers and pedestrians. Final report.

National Highway Traffic Safety Administration, Washington, D.C.