Road design

Table of Contents

Appendix B Ramp Terminal Location

The amount of bridge widening can be determined using Figure B 1.

Figure B 1: Ramp terminal location compared to bridge rail offset

Example

A bridge over which the operating speed of traffic is 80 km/h is to have 3.5 m lanes and a 2.0 m wide footpath. Determine the minimum distance that the ramp terminal should be located from the end of the bridge railing.

Solution: x = 3.5/2 + 2.0 = 3.75 m

From the graph in Figure B1, x = 3.75 and an 80 km/h speed, y = 44.8 m. The driver’s eye should therefore be a distance of 44.8 m from the end of the bridge railing.