12 - Chapter-12

# 12 - Chapter-12 - Geometric Design Manual-2002 Chapter 12...

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Chapter 12 At-Grade Junctions Geometric Design Manual-2002 Page 12-2 Ethiopian Roads Authority 12.2.3 M ANEUVERABILITY (i) All traffic lanes should be of adequate width and radius for the appropriate vehicle turning characteristics. To accommodate truck traffic, turn radii shall be 15 meters minimum. (ii) The edges of traffic lanes should be clearly indicated by road markings. The operation of the junction depends principally upon the frequency of gaps that naturally occur between vehicles in the main road flow. These gaps should be of sufficient duration to permit vehicles from the minor road to merge with, or cross, the major road flow. In consequence junctions are limited in capacity, but this capacity may be optimized by, for example, canalization or the separation of maneuvers. 12.3 Selection of Junction Type The choice of a junction type requires knowledge of traffic demand, intersection performance and accident prediction. It is often difficult to determine the best intersection type of any particular situation, taking into account capacity, delay, safety and physical layout factors. Several alternatives may be possible at a junction. A guide for the selection of
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