Input
Results
A coefficient—
B coefficient—
Capacity c (veh/hr)—
PCE-adjusted demand v_e,pce—
V/C ratio—
Approx. LOS—
Method
HCM 2010 Eq. 21-1: c = A · exp(−B · v_c). For 1-lane entry: A=1130, B=0.001 (per 1L circ), or A=1130, B=0.0007 (2L circ). For 2-lane entry to 2-lane: c_left=1130·exp(−0.00075·v_c), c_right=1130·exp(−0.00084·v_c). Adjust v_e by PCE for heavy vehicles: v_e,pce = v_e · (1 + p_HV·(PCE−1)).