Geometric Design MCQ with answer and solution

Concept

Minimum carriage way width for two-lane road

Formula

NONE

Step-by-step solution

1. According to Indian Roads Congress (IRC) standards, lane width depends on the number of lanes and presence of raised curbs. 2. The standard width for a single lane road is 3.75 m. 3. For a two-lane road without raised curbs, the recommended minimum carriageway width is 7.0 m. Answer: A

Explanation

According to Indian Roads Congress standards, the standard lane width for vehicular movement is 3.5 meters. For a two-lane carriageway without raised curbs, two standard lanes require a combined minimum width of 7.0 meters. If raised curbs are present, the recommended width increases to 7.5 meters.

Why the other options are wrong

B) 3.75 m is the standard width for a single-lane carriageway. C) 12.5 m is much wider than required for a standard two-lane road without raised curbs. D) 15 m is designed for multi-lane highways or four-lane roads.

Shortcut

Two-lane carriageway width: 7.0 m without raised kerbs, 7.5 m with raised kerbs.

Common mistake

Confusing the carriage way width for a two-lane road without raised curbs (7.0 m) with one having raised curbs (7.5 m) or single-lane roads (3.75 m).