<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In Egypt, intersections are encountering congestion and safety problems. Midblock U-turns have been used for solving these problems. The midblock U-turn increased the accidents, besides, it has limited capacity. In the last decade, elevated U-turns have been applied to solve these problems. The extensive use of elevated U-turns has not been accompanied by any research for studying the performance of elevated U-turns with respect to safety and economy. This paper developed a simple framework for comparing elevated and traditional midblock U-turns in terms of safety and economy. The study applied a case study to evaluate the two alternatives using a benefit-cost analysis technique. Although the results show the high cost of the elevated U-turns, it has been demonstrated to be the best solution since they provide the greater traffic capacity and lower accident rates. Accident number reported at elevated U-turns was 59 % less than the number associated with traditional U-turns.</p>
</abstract>

In Egypt, intersections are encountering congestion and safety problems. Midblock U-turns have been used for solving these problems. The midblock U-turn increased the accidents, besides, it has limited capacity. In the last decade, elevated U-turns have been applied to solve these problems. The extensive use of elevated U-turns has not been accompanied by any research for studying the performance of elevated U-turns with respect to safety and economy. This paper developed a simple framework for comparing elevated and traditional midblock U-turns in terms of safety and economy. The study applied a case study to evaluate the two alternatives using a benefit-cost analysis technique. Although the results show the high cost of the elevated U-turns, it has been demonstrated to be the best solution since they provide the greater traffic capacity and lower accident rates. Accident number reported at elevated U-turns was 59 % less than the number associated with traditional U-turns.

Midblock U-Turn and Elevated U-Turn Safety and Economy Comparison: A Case Study Application

Civil Engineering Department, Faculty of Engineering

Civil and Environmental Engineering

This work is licensed under the Creative Commons Attribution 4.0 International License.

In Egypt, intersections are encountering congestion and safety problems. Midblock U-turns have been used for solving these problems. The midblock U-turn...

Midblock U-Turn and Elevated U-Turn Safety and Economy Comparison: A Case Study Application

Published Online: Jun 22, 2021

Page range: 139 - 149

DOI: https://doi.org/10.2478/cee-2021-0015

Keywords
Safety performance function, Crash modification factor, Empirical bayes, U-turn, Before-after study

© 2021 Osama H. Ahmed et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Midblock U-Turn and Elevated U-Turn Safety and Economy Comparison: A Case Study Application

Published Online: Jun 22, 2021

Page range: 139 - 149

DOI: https://doi.org/10.2478/cee-2021-0015

KeywordsSafety performance function, Crash modification factor, Empirical bayes, U-turn, Before-after study

© 2021 Osama H. Ahmed et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Safety performance function, Crash modification factor, Empirical bayes, U-turn, Before-after study