M22-01. 20 Design Manual
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- Chapter 1360 Interchanges WSDOT Design Manual M 22-01.20 Page 1360-2 September 2021 1360.02
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General The primary purpose of an interchange is to reduce conflicts caused by vehicle crossings and minimize conflicting left-turn movements. Provide interchanges on all Interstate highways and freeways, and at other locations where traffic cannot be controlled efficiently by intersections at grade. For additional information, see the following: Chapter 520 Access control Chapter 530 Limited access Chapter 550 Access Revision Report Chapter 1103 Design controls Chapter 1106 Design element dimensions Chapter 1240 Turning widths Chapter 1250 Cross Slope and Superelevation Chapter 1310 Intersections Chapter 1410 HOV lanes Chapter 1420 HOV direct access connections Chapter 1360 Interchanges WSDOT Design Manual M 22-01.20 Page 1360-2 September 2021 1360.02 Interchange Design 1360.02(1) General All freeway exits and entrances, except HOV direct access connections, are to connect on the right of through traffic. Variations from this will be considered only for special conditions. HOV direct access connections may be constructed on the left of through traffic when they are designed in accordance with Chapter 1420. Provide complete ramp facilities for all directions of travel wherever possible. However, give primary consideration to the basic traffic movement function that the interchange is to fulfill. Complications are rarely encountered in the design and location of rural interchanges that simply provide a means of exchanging traffic between a limited access freeway and a local crossroad. Carefully consider the economic and operational effects of locating traffic interchanges along a freeway through a community, particularly with respect to local access, to provide convenient local service without reducing the capacity of the major route(s). Where freeway-to-freeway interchanges are involved, do not provide ramps for local access unless they can be added conveniently and without detriment to efficient traffic flow or reduction of capacity, either ramp or freeway main line. When exchange of traffic between freeways is the basic function, and local access is prohibited by access control restrictions or traffic volume, separate interchanges for local service may be needed. tải về 1.86 Mb. Chia sẻ với bạn bè của bạn:
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