Discuss the fundamental general principles that should be used in designing a channelized at-grade intersection.
What will be an ideal response?
There are several fundamental principles considered in channelized
intersection design. Regarding guidance to the motorist, motorists should not be
required to make more than one decision at a time. Merging and weaving areas
should be as long as possible, but other areas of conflict between vehicles should
be reduced to a minimum. Crossing traffic streams that do not weave or merge
should intersect at 90°, although a range of 60-120° is acceptable; adequate sight
distance is provided regardless of angle. Sharp reverse curves and turning paths
greater than 90° should be avoided. Separate space should be provided for turning
vehicles so that they do not interfere with the movement of through vehicles.
Prohibited turning movements should be blocked with channelized islands
wherever possible. Finally, the location of essential traffic control devices should
be considered in the design process.
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