INTRODUCTION
he Development of Image Sensing Technique including
CCTVs Concepts and Intelligent Transport System
(ITS) will be taken into consideration as follows:
Development of Software (Visual C++) for traffic classified
counts, headways and the average speed is applied by the
virtual loop detectors (VLD). Virtual Loop Detectors have
two functions; one is for traffic classified counts, such as
five types of vehicles. The other is for vehicle tracking when
approaching to VLD and for checking headway within the
appropriate times in order to measure the stating and final
speed of each vehicle. As a result, the Stopping Sight
Distance (SSD) and Passenger Car Unit (PCU) will be
calculated. In new PCU Concept, a new empirical formula
was found and it is useful for Thai Engineers. In addition,
the minimum lane width will be proposed on the existing
road in order to increase the efficient capacity of traffic
volumes in each lane. Letters Sizes shown on a Variable
Message Sign (VMS) are calculated under the criteria of
Geometrical Design, especially PIEV (Perception,
Intelligent, Emotion and Violation) Distances.
In case of passenger car equivalent (PCE), it was
introduced in the 1965. Highway Capacity Manual in
U.S.A. defined it as “the number of passenger cars displaced
in the traffic flow by a truck or a bus, under the prevailing
INTRODUCTIONhe Development of Image Sensing Technique includingCCTVs Concepts and Intelligent Transport System(ITS) will be taken into consideration as follows:Development of Software (Visual C++) for traffic classifiedcounts, headways and the average speed is applied by thevirtual loop detectors (VLD). Virtual Loop Detectors havetwo functions; one is for traffic classified counts, such asfive types of vehicles. The other is for vehicle tracking whenapproaching to VLD and for checking headway within theappropriate times in order to measure the stating and finalspeed of each vehicle. As a result, the Stopping SightDistance (SSD) and Passenger Car Unit (PCU) will becalculated. In new PCU Concept, a new empirical formulawas found and it is useful for Thai Engineers. In addition,the minimum lane width will be proposed on the existingroad in order to increase the efficient capacity of trafficvolumes in each lane. Letters Sizes shown on a VariableMessage Sign (VMS) are calculated under the criteria ofGeometrical Design, especially PIEV (Perception,Intelligent, Emotion and Violation) Distances.In case of passenger car equivalent (PCE), it wasintroduced in the 1965. Highway Capacity Manual inU.S.A. defined it as “the number of passenger cars displacedin the traffic flow by a truck or a bus, under the prevailing
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