Geometry > Calibration > HCM Calibration

HCM Calibration

HCM calibration applies to both the exponential coefficients and to the capacity intercepts. The standard values are shown and can be superseded by input calibrated values. The calibrated values are applied to both entry and bypass capacity estimation.



The HCM capacity = A × ep where p = -B vc

vc = the circulating flow (pc/hr)

A = Intercept (pc/hr)

B = Exponential Coefficient

A = 3600 ÷ t f where tf is the observed follow-up headway (secs)

B = (tc – 0.5tf ) 3600 where tc is the observed critical headway (secs)


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