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Safety Effects of Using Narrow Lanes and Shoulder-Use Lanes to Increase the Capactity of Urban Freeways. Summary Report.
| 题名： | Safety Effects of Using Narrow Lanes and Shoulder-Use Lanes to Increase the Capactity of Urban Freeways. Summary Report. |
| 关键词： | *Traffic-safety; *Traffic-lanes; *Urban-transportation; *Freeways-.;Traffic-volumes; Highway-departments; Traffic-operations; Roads-; Vehicle-traffic-control. |
| 摘要： | As traffic volumes grow on urban freeways, highway agencies face an ongoing challenge to maintain efficient traffic operations and acceptable levels of service. Increasing the capacity of a freeway by adding a lane can be difficult and expensive if it involves widening the existing roadbed, regrading roadside areas, and/or acquiring additional right-of-way. A number of highway agencies, however, have implemented projects in which a travel lane is added on an urban freeway by restriping the traveled way with narrower lanes, converting all or part of the shoulder to a travel lane, or a combination of both. The traffic operational benefits of such conversions are immediate and obvious, but the safety effects are uncertain. This study addresses these safety effects. |
| 报告类型： | 科技报告 |
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