tailieunhanh - Design Manual Metric 2009 Part 6

Tham khảo tài liệu 'design manual metric 2009 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | a Two-lane two-way roadways. Figure 640-7a shows the traveled way width W for two-lane two-way roadways. For values of R between those given interpolate W and round up to the next tenth of a meter. Minimum traveled way width W based on the delta angle of the curve is shown in Figure 640-7b. Round W to the nearest tenth of a meter. b Two-lane one-way roadways. Figure 640-8a shows the traveled way width for two-lane one-way turning roadways including two lane ramps and four lane divided highways. For values of R between those given interpolate W and round up to the next tenth of a meter. Treat each direction of travel of multilane divided facilities as a one-way roadway. Minimum width W based on the delta angle of the curve is shown in Figure 640-8b. Round W to the nearest tenth of a meter. To keep widths to a minimum traveled way widths for Figures 640-8a and 8b were calculated using the WB-12 design vehicle. When volumes are high for both trucks larger than the WB-12 and other traffic consider using the widths from Figures 640-7a and 7b. c One-lane one-way roadways. Figure 640-9a shows the traveled way width for one-lane one-way turning roadways including one lane ramps. For values of R between those given interpolate W and round up to the next tenth of a meter. For minimum widths based on the delta angle of the curve use Figure 640-9b for one-lane roadways using the radius to the outer edge of the traveled way and Figure 640-9c for one-lane roadways using the radius on the inner edge of the traveled way. Round W to the nearest tenth of a meter. Build shoulder pavements at full depth for one-lane one-way roadways because to keep widths to a minimum traveled way widths were calculated using the WB-12 design vehicle which may force larger vehicles to encroach on the shoulders. d Other roadways. For multilane two-way undivided roadways use the following W Wa_xN_ W 2 Where W The multilane roadway width. Wa The width from 2 a for a two-lane two-way roadway. N .