Refers to the forward area between a lead vehicle and a following vehicle, in time or distance. For this proposal, time headway, the elapsed time between the front of the lead vehicle passing a point on the roadway and the front of the following vehicle passing the same point, is used. Headway = Range/Velocity of the following vehicle. Headway may also refer to the time between the SV and the closest forward vehicle in the destination lane, or the time between a following vehicle in the destination lane and the SV ahead of it.
The scheduled time interval between any two revenue vehicles operating in the same direction on a route. Headways may be LOAD driven, that is, developed on the basis of demand and loading standards or, POLICY based, i.e., dictated by policy decisions such as service every 30 minutes during the peak periods and every 60 minutes during the base period. (Sacramento Regional Transit District)
The headway between vehicles in public transit systems is the amount of time (usually in minutes) that elapses between two vehicles passing the same point traveling in the same direction on a given route. This term is most frequently applied to rail transport, where the number of tracks is limited and signaling capabilities (usually) control the headway time.