Free Web Tool · HCM Signal

Signal LOS

Approach control delay per HCM Eq. 19-18 (d = d1·PF + d2 + d3) with V/C ratio, capacity, and LOS A–F.

Input

Results

g/C
Capacity c = s·g/C (per lane)
Total cap c·lanes
V/C = X
Uniform delay d1
Incremental delay d2
Total delay d (s/veh)
LOS
Method

d1 = 0.5·C·(1 − g/C)² / (1 − min(1,X)·g/C). d2 = 900·T·[(X−1) + √((X−1)² + 8·k·I·X/(c·T))]. d = d1·PF + d2 + d3. LOS: A ≤10, B ≤20, C ≤35, D ≤55, E ≤80, F >80 s/veh.