Geometry > Bypass Approach > Bypass Approach Width Vb

Bypass Approach Width Vb

Besides the two types of bypasses, each can have different types of Approach Width Vb which may be part of or separate from the Entry Approach Width V.

Entry and Bypass – Separate (independent) Approach Widths



The Roundabout entry is fed by 12 ft of the total approach width. This is used only by Roundabout traffic. The Bypass has a separate 12 ft lane that is used only by Bypass traffic.


Entry and Bypass – Full Lane Sharing of Approach Road



The Roundabout entry is fed by the total 24 ft approach width (both approach lanes).

The Bypass is fed by the 12 ft right approach lane.

The roundabout traffic has two lanes: one dedicated approach lane and one approach lane shared with the bypass traffic.


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