Signalised Intersection Delay & LOS (Basic)

Uses Webster’s uniform delay formula to estimate average control delay and LOS for a single signalised approach, based on cycle length, effective green, saturation flow and demand.

1. Approach & flow data

Just for labeling in reports / exports.
Approach flow in the analysis hour (PCU/h).
Lanes effectively serving this movement.

2. Signal timings & saturation flow

Total cycle length including lost times.
Effective green for this approach (green + amber – lost).
Typical values ~1800–2000 pcu/h/ln.

Capacity per lane: c_lane = s · (g/C)
Total capacity: c = c_lane · N_lanes, degree of saturation: X = v / c.
Webster uniform delay (approximate):
d = [0.5 · C · (1 − g/C)²] / [1 − min(1, X) · g/C] (s/veh).