4-6. Scheduling Traffic, Continued
An infiltration schedule is a rate of dispatch assigned to units for specific routes
and time blocks for the purpose of achieving a traffic flow within the capacity of
the route. Using this method, dispatched vehicles or small groups of vehicles
proceed independently to their destinations over a prescribed route. By assigning
appropriate rates of dispatch to different units using the same route, you can hold
average traffic flow within desired limits. For example, dispatch two vehicles
every five minutes the first hour and every 10 minutes the second hour. An
infiltration schedule may be used for open or supervised routes.
The route schedule is a flexible method of scheduling. It apportions blocks of
time on MSRs to units, types of movements, phases of the operation, or route
maintenance. A route schedule may be used for supervised, dispatch, or reserved
routes. It provides no control over movements to and from the dispatch route.
A location schedule assigns arrival and clearance times to different units needing
to use the same entry point onto MSRs. This schedule should prevent clogging of
the traffic stream. For example, at a particular checkpoint, unit A may be
scheduled to arrive at 1000 hours and clear at 1015, while unit B may be
scheduled to arrive at 1020 and clear at 1030. A location schedule may be used
for supervised or dispatch routes.
The column schedule is the most restrictive method of scheduling. It indicates
arrival and clearance times at specific points along a prescribed route of march. A
column schedule may provide the most effective highway regulation because it
provides in-transit times to reach checkpoints and helps the pacesetter maintain
the prescribed rate of march. It may be used for supervised, dispatch, or reserved
routes. It should be used when congestion is anticipated.
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