In an attempt to evaluate the effectiveness of various safety improvements on approximately five miles of i75 in northern kentucky, a before-and-after analysis of accidents was conducted. Safety improvements were: (1) a variable message signing system in the northbound direction; (2) a new Jersey-type median barrier wall; and (3) general improvements such as guardrail end treatments, break-away sign installations, contour grading, etc. Results indicate the safety improvements were effective in reducing the overall accident rate. Separate analysis also revealed that variable message signs were effective in bringing about a significant reduction in accident rates. There were no fatalities during either of the data collection periods. However, accident severity increased after the improvements. Results were influenced by low skid resistance, continued wear in wheel tracks, and increasing congestion throughout the study section. (Author/publisher)
Samenvatting