13.5.2.2 Travel Time

Travel time calibration criteria are separated into two types of roadway facilities: uninterrupted flow and interrupted flow. To calibrate a model, the allowable travel time variation is measured using the equations shown in
Table 13-3: Travel Time Calibration Criteria
Facility Type
Equation
Free-Flowing
freeflowing equation
Interrupted Flow
Interrupted flow equation
∆ = Allowable Travel Time Variation (+/- seconds)
t = Real-World Travel Time (seconds)
L = Length (ft)
S = Free Flow Speed (FFS) in mph; Posted Speed can be used for FFS if unknown