M22-01. 20 Design Manual
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- Chapter 1360 Interchanges WSDOT Design Manual M 22-01.20 Page 1360-20 September 2021
| Chapter 1360
Interchanges WSDOT Design Manual M 22-01.20 Page 1360-19 September 2021 Exhibit 1360-13 Gore Area Characteristics Notes: [1] The reserve area length (L) is not less than: Main Line Design Speed (mph) 40 45 50 55 60 65 70 80 L (ft) 25 30 35 40 45 50 55 70 [2] 𝑍 = 𝐷𝑒𝑠𝑖𝑔𝑛 𝑆𝑝𝑒𝑒𝑑 2 , design speed is for the main line. [3] Radius may be reduced, when protected by an impact attenuator. [4] This lane is omitted for a single-lane, one-lane reduction off-connection Chapter 1360 Interchanges WSDOT Design Manual M 22-01.20 Page 1360-20 September 2021 1360.04(6) Collector-Distributor Roads A Collector-Distributor (C-D) road can be within a single interchange, through two closely spaced interchanges, or continuous through several interchanges. Design C-D roads that connect three or more interchanges to be two lanes wide. Other C-D roads may be one or two lanes in width, depending on capacity. Consider intermediate connections to the main line for long C-D roads. a. Exhibit 1360-24 shows the designs for collector-distributor outer separations. Use Design A, with concrete barrier, when adjacent traffic in either roadway is expected to exceed 40 mph. Design B, with mountable curb, may be used when adjacent posted speed does not exceed 40 mph. b. The details shown in Exhibit 1360-25 apply to single-lane C-D road off-connections. Design a two- lane C-D road off-connection, with the reduction of a freeway lane or an auxiliary lane, as a normal two-lane off-connection in accordance with Section 1360.04(5). c. Design C-D road on-connections in accordance with Exhibit 1360-26. tải về 1.86 Mb. Chia sẻ với bạn bè của bạn:
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