Traveled Way Widening w widening = Wc - Wn Wc Width on curve Wn Width on tangent
N U C FA Z
1 330
1.1 415
1.1 540
1.2 665
0.45 0.6 0.75 0.9
Wc = N(U+C)+(N-1)FA+Z Number of lanes Track width of design vehicle Lateral clearance Width of front overhang of inner-lane vehicle Extra width allowance
Vehicle Side Friction <f_table> C MPH f 1.5 10 0.38 2 15 0.32 2.5 20 0.27 3 25 0.23 30 0.2 35 0.18 40 0.16 45 0.15 50 0.14 55 0.13 60 0.12 65 0.11 70 0.1 75 0.09 Traveled Way Widening 80 0.08 widening = Wc - Wn Width on curve Width on tangent
DesVeh P SU BUS-40 BUS-45 CITY-BUS S-BUS-36 S-BUS-40 A-BUS WB-40 WB-50 WB-62 WB-65/67 WB-67D WB-100T WB-109D MH P/T P/B MH/B
Wc = N(U+C)+(N-1)FA+Z Number of lanes Track width of design vehicle = u + R - sqrt(R^2 - sum(Li^2)) Lateral clearance Width of front overhang of inner-lane = sqrt(R^2+A(2L+A)) vehicle -R Extra width allowance = V/sqrt(R)