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• W640574480 abstract "The objective of this research project was to evaluate the effectiveness of offset opposing left-turn lanes at signalized intersections in reducing the frequency and severity of left-turn related accidents. The cities of Lincoln and Omaha offset opposing left-turns by widening left-turn lane lines in June 1999 at six intersections. The research team investigated traffic accident patterns between January 1994 and December 2002 at those six intersections by making comparisons with two control intersections (i.e., intersections at which left-turns were not offset by lane line widening) using a four-step research methodology. First, existing literature was reviewed to determine the extent and availability of materials relevant to this project. Second, accident data were collected for the six study and two control intersections. The third step involved the analysis of the collected data. Four analysis techniques were employed to assess the effectiveness of off-setting opposing left-turn lanes by using wider left-turn lanes lines. Results from the trend analysis of accident frequencies and accident rates presented a mixed picture of the 'before' (pre-June 1999) and 'after' (post-June 1999) data. In the absence of a clear-cut increasing or decreasing trend in the accident frequencies and rates, the research team conducted an in-depth analysis of the collected data. Accident/crash rates were analyzed by using linear regression while accident frequencies were re-analyzed by the Before-After (B-A) analysis and by using Poisson regression modeling. Crash rate modeling showed mixed results since rates were increasing and decreasing at various intersections with time and either increased or decreased in the 'after' time period. Only the 72nd and Cass intersection in Omaha appeared to have experienced statistically significant crash rate reduction. The B-A analysis of accident frequency was conducted using the simple and the comparison group (C-G) methods. Overall, the simple method indicated that accident frequency decreased in the 'after' period. However, in the simple B-A analysis, the change in safety reflects upon all sundry factors such as traffic, weather, driver behavior, etc., that might have changed between the 'before' and 'after' periods. The C-G method indicated that there was a decrease in the frequency of accidents in the 'after' period that can be attributed to offsetting opposing left-turns. The Poisson regression modeling of accident frequency took into consideration the effects of traffic at the intersections and indicated a limited reduction in the accident frequency in the 'after' period. The last part of the analysis was focused on injury severity - Ordered logit models were estimated in this case. The models indicated that maximum injury severity decreased in the 'after' period after taking into account the traffic effects in the 'before' and 'after' periods. The fourth step consisted of developing conclusions and recommendations for future research based on the results of this study." @default.
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• W640574480 date "2004-12-01" @default.
• W640574480 modified "2023-09-27" @default.
• W640574480 title "SAFETY EVALUATION OF LEFT-TURN LANE LINE WIDTH AT INTERSECTIONS WITH OPPOSING LEFT TURN LANES" @default.
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