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Traffic Control Signal Design Manual.
| 题名： | Traffic Control Signal Design Manual. |
| 关键词： | signal；control；manual；traffic；designer；landscape；platoon；utilities；attention；geometry |
| 摘要： | Before a traffic control signal is designed it must be determined if the signal is warranted and needed through a review of the volumes, sightlines, accident experience, turning movements, geometry and input from local officials. Once it is determined that a traffic control signal will be installed, it is necessary to perform preliminary analysis to determine geometry, lane arrangement and phasing. The geometric design of an intersection involves several critical decisions about the number and use of lanes to be provided on each approach. Factors to be considered include but are not limited to the functional classification of the roadway; the proximity of nearby signals; the degree of need for platoon cohesion; level of service and; volume to capacity ratios. When installing or revising a traffic control signal, the designer must take into account the physical setting in which the signal will be located. Visiting the site to get a 'feel for' the area is important so that the designer can understand the landscape and the community in which the design will have to assimilate. Sensitivity to the placement of appurtenances to minimize their aesthetic impact on adjacent development, particularly residential, should be considered. An effort should be made to limit environmental impacts while maintaining safety and mobility. The designer should always be cognizant of where signal equipment will be placed in relation to existing appurtenances. A survey may be needed to show above-ground and under-ground utilities. Also, test pits may be required depending on information from the survey. If the signal equipment cannot be located without potential utility conflicts, the designer should bring it to the attention of the Division of Traffic Engineering. In some instances design criteria set forth by the Regulations of the State Traffic Commission are more stringent than those of the Manual on Uniform Traffic Control Devices (MUTCD). In those cases, the Regulations of the State Traffic Commission will govern. |
| 报告类型： | 科技报告 |
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