Studies have shown that the traffic flow on a two-lane road adjacent to aschool can be described by the Greenshields model. A length of 0.5 miadjacent to a school is described as a school zone and operates for a periodof 30 min just before the start of school and just after the close of school.The posted speed limit for the school zone during its operation is 15 mi/h.Data collected at the site when the school zone is not in operation showthat the jam density and mean free speed for each lane are 125 veh/mi and57 mi/h. If the demand flow on the highway at the times of operation ofthe school zone is 90% of the capacity of the highway, determine: The speeds of the shock waves created by the operation of the schoolzone, and• The number of vehicles affected by the school zone in the upsream ofthe zone during this 30-minute operation.
Studies have shown that the traffic flow on a two-lane road adjacent to a
school can be described by the Greenshields model. A length of 0.5 mi
adjacent to a school is described as a school zone and operates for a period
of 30 min just before the start of school and just after the close of school.
The posted speed limit for the school zone during its operation is 15 mi/h.
Data collected at the site when the school zone is not in operation show
that the jam density and mean free speed for each lane are 125 veh/mi and
57 mi/h. If the demand flow on the highway at the times of operation of
the school zone is 90% of the capacity of the highway, determine:
The speeds of the shock waves created by the operation of the school
zone, and
• The number of vehicles affected by the school zone in the upsream of
the zone during this 30-minute operation.
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