o
Whether speed limits are too fast or too slow.
o
Proper speeds for new or improved roads.
o
If and where traffic-control devices are needed.
o
The relationship between speed and the number of accidents.
o
The effectiveness of speed control programs.
o
The need for change in the enforcement program.
(6) Speed-Delay Studies
These studies are used to determine--
o Speed variations along a route at different times.
o Overall speed and travel time along a route.
o Points of congestion and insufficient road capacity.
Speed-delay studies assist in assigning priorities in traffic-control and road-construction programs.
(7) Motor Vehicle Volume Studies
The motor vehicle volume studies are used to obtain information on the number, direction, and
variations in vehicles passing through a specific intersection or major route. These studies evaluate the
effectiveness of traffic-control devices and may justify the need for--
o
Stop signs.
o
Speed zones.
o
Pavement markings.
o
MPs on traffic-control duty.
(8) Roadway Capacity Studies
Roadway capacity studies--
o
Determine the practical capacity of roads and streets.
o
Provide a basis for changing traffic regulations.
o
Establish priorities for street improvement.
o
Assist future planning.
Traffic density is the number of vehicles per hour passing a selected point or the number of vehicles per
mile on a selected portion of road.
Traffic capacity is the maximum traffic density a road can accommodate at a given speed without delay.
(9) Traffic Accident Studies
The purpose of studying traffic accident records is to find ways to increase vehicle safety and to reduce
the frequency of accidents.
2-5
MP2000
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