About Superelevation on Divided Roads

This section describes situations for divided roads and illustrates how superelevation is applied for each situation.

Dual Planar Carriageways

The following illustration shows a divided road as the corridor type and the cross section shape is planar. The carriageway undergoes adverse superelevation applied from Low channel during superelevation:

Dual Crowned Carriageways

The following illustration shows a divided road as the corridor type and a crowned cross section shape on each side. The carriageway undergoes adverse superelevation applied from Low channel during superelevation:

Central Reserve Treatments

In dual carriageways, there are typically two options for superelevating each side of a dual carriageway.

Note: For some pivot types, only one central reserve treatment is valid. For example, a Dual Crowned Carriageway that pivots at Centers can produce only a distorted central reserve .

Maintain Central Reserve Shape

Maintain Central Reserve Shape means when superelevation is applied, the central reserve raises to accomodate the superelevation. This option maintains the central reserve shape, and the pivot points raise or lower.

Distorted Central Reserve

Distorted Central Reserve means when superelevation is applied, the central reserve width remains that same, but either side raises or lowers to accomodate the superelevation. This option distorts the central reserve shape, and the pivot points maintain their original position.