Author : Mashrur A. Chowdhury
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.3/5 (555 download)
Book Synopsis Evaluating the Effects of Prohibiting Left Turns and the Resulting U-turn Movement by : Mashrur A. Chowdhury
Download or read book Evaluating the Effects of Prohibiting Left Turns and the Resulting U-turn Movement written by Mashrur A. Chowdhury and published by . This book was released on 2003 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to evaluate the operational and safety effects of restricting direct left turns from a driveway and providing alternatives to accommodate the left turn deterred traffic. This study was conducted in three phases: survey of state agencies, operational analysis, and safety assessment. Very little operational difference was found between no restrictions on direct left turns versus the restrictions with the U-turn alternative movements from site to site. While changes in the traffic volumes on the mainline had an impact in specific instances, no definite trends were apparent. As a result of all findings in this study, it is proposed that alternatives must be evaluated on a site-by-site basis. This study also found the jughandle design to be a superior alternative for accommodating left-turn deterred traffic for multi-lane divided and undivided sites compared to mid-block or intersection U-turns. The safety assessment revealed that a right turn followed by a U-turn movement is safer than the direct left turn.