Table of Contents

6.12.7 Diverging Diamond Interchange

A diverging diamond interchange configuration eliminates the need of right-turning vehicles to cross through movements by switching the direction of traffic at the interchange. The diverging diamond interchange can improve the operations of turning movements to and from the motorway and reduce conflict points compared to conventional designs. The key features of the diverging diamond interchange are shown in Figure 6.26.

Figure 6.26: Key features of a diverging diamond interchange

Source: Adapted from Federal Highway Administration (FHWA) (2014).

There are two options for operating the diverging diamond interchange. The first is to favour the cross-street traffic (Figure 6.27) and the second is to favour the exit ramp traffic (Figure 6.28).

Figure 6.27: Operation of diverging diamond interchange favouring the cross-street traffic

Source: Adapted from FHWA (2014).

Figure 6.28: Operation of diverging diamond interchange favouring exit ramp traffic

Source: Adapted from FHWA (2014).