Carriageway Width Calculator

IRC Lane Requirement Calculator

Based on IRC:64-1990, Indo-HCM principles & field studies (mixed traffic, rural/inter-urban highways).

Name of the Road / Section

Current AADT (P) [veh/day]

Growth Rate (r) [%]

Design Life (n) [years]

K-Factor (Peak Hour %)

D-Factor (Directional Split)

Terrain & Base Capacity per Lane as per IRC:64-1990 Table 2 Plain - Curvature (Degrres/KM) Low (0 - 50) Plain - Curvature (Degrres/KM) High (>51) Rolling - Curvature (Degrres/KM) Low (0 - 100) Rolling - Curvature (Degrres/KM) high (>101) Hilly - Curvature (Degrres/KM) Low (0 - 200) Hilly - Curvature (Degrres/KM) high (>201)

V/C Ratio (Target LOS) LOS B (High Comfort - 0.5) LOS C (Standard - 1.4 x 0.5) LOS D (Congested - 0.9, 8-10% of AADT)