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Longitudinal spacing of vehicles are of particular importance from the points
of view of safety, capacity and level of service.
The longitudinal space occupied by a vehicle depend on the physical dimensions
of the vehicles as well as the gaps between vehicles.
For measuring this longitudinal space, two microscopic measures are used-
distance headway and distance gap.
Distance headway is defined as the distance from a selected point (usually
front bumper) on the lead vehicle to the corresponding point on the following
vehicles.
Hence, it includes the length of the lead vehicle and the gap length between
the lead and the following vehicles.
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