Table of Contents

11.2.3 Exits to Two High-speed Roadways

A different type of operation applies where it is necessary for traffic to diverge to two high-speed roads that are of similar importance. In this case, both roadways diverge tangentially instead of one diverging at an angle as with a normal ramp – commonly referred to as a ‘major fork’. This type of arrangement is usually adopted only when the right-turning traffic is greater than 50% of the total traffic.

Figure 11.4 illustrates the principle of diverging two major roadways, where the layout is based on achieving a high standard of alignment for both high-speed movements. This arrangement may be applied at a system interchange.

Figure 11.4: Major fork (or diverge)

GRD Part 4C Fig 11

Source: Department of Main Roads (2005).
Department of Main Roads (2005) has been superseded and Figure 11.4 has not been carried forward into Department of Transport and Main Roads (2014).