Author
Abstract
Traffic control devices notify road users of regulations and provide warning and
guidance needed for safe, uniform, and efficient operation of all elements of the traffic
stream. Traffic control devices have been a part of the roadway system. Researches
have evaluated various aspects of the design, operation, placement, and maintenance
of traffic control devices.
The purpose of this research is to develop a simulation model in order to
evaluate the effect of overhead sign position on the traffic performance at exit of
freeway weaving area. To achieve that subroutine was developed and added to
FWASIM program to compute the sign position and compare it with the driver sight
distance. Following that a proposed example represents an exit weaving area was
examined with different traffic flow configuration (different percentages of link flow
and on-ramp flow) with respect to no sign installed and other three sign positions.
Results indicate that the average traffic speed is underestimated when there is no sign
installed, while no significant effect is shown when the sign position is changed within
the driver sight distance.
In conclusion Guide signing is a critical element in the effective, efficient and
safe operation of motorways and expressways. Signing issues must, therefore, be fully
considered at the feasibility stage of any project.
Keywords
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