Table of Contents

8.3.1 General

When the form of the interchange has been determined, the ramps should be designed on alignments and to standards that suit the particular location. The design of the ramp should be determined by the physical limitations of the site, the traffic pattern, traffic volume, design speeds, topography, intersection angle, type of ramp terminal and the necessity or otherwise of reducing the amount of land required. Whatever the shape of the ramp, the requirements with respect to design speed, sight distance and terminal intersection design should be achieved.

Ideally, the alignment should have the exit ramp on an up-grade and the entry ramp on a down grade to assist drivers to decelerate and accelerate, particularly the drivers of heavy vehicles.