Designing for Target Speed
| 项目名称： | Designing for Target Speed |
| 摘要： | The American Association of State Highway and Transportation Officials (AASHTO) defines design speed as “a selected speed used to determine the various geometric features of the roadway. The assumed design speed should be a logical one with respect to the topography, anticipated operating speed, the adjacent land use, and the functional classification of the highway.” The working definition for “target speed” is the operating speed that the designer intends for drivers to use. The topic of “design speed” versus “target speed” typically focuses on low-speed urban and suburban roadways, especially where the 85th percentile speed is higher than the posted speed limit. Research is needed to gain a better understanding of how roadway, roadside, and non-roadway elements influence the operating speed—the actual speed of the driver—in order to improve roadway designs and reliably achieve desired speed outcomes. The objectives of this research are to (1) determine the effects of roadway, roadside, and non-roadway elements on operating speeds on roadways with a target speed between 30 and 40 mph and (2) develop recommendations on how the findings can be incorporated into the roadway design process. |
| 状态： | Active |
| 资金： | 750000 |
| 资助组织： | National Cooperative Highway Research Program<==>Federal Highway Administration<==>American Association of State Highway and Transportation Officials (AASHTO) |
| 项目负责人： | Crichton-Sumners, Camille |
| 执行机构： | Texas A&M Transportation Institute (TTI) |
| 开始时间： | 20200729 |
| 预计完成日期： | 20230116 |
| 主题领域： | Design；Highways；Operations and Traffic Management |
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