Roadway cross-section planning The overall width provided in a road cross-section depends mainly on which of the following?

Introduction / Context:
Roadway width planning must accommodate current and future traffic, safety clearances, and separators such as medians. The term 'roadway' here refers to the overall cross-section within the carriageway limits (and may include medians where present).

Given Data / Assumptions:

• Urban or rural highway with possible medians.
• Standard lane widths used for design.

Concept / Approach:
Carriageway width = number of lanes * lane width. Medians (where provided) add to the overall cross-sectional width. Hence, all listed items influence the planned width.

Step-by-Step Solution:
Lane width sets base width.Number of lanes scales the base width.Median width increases the total cross-section required.Therefore, all factors apply.

Verification / Alternative check:
Cross-section drawings illustrate how each component adds to total roadway width.

Why Other Options Are Wrong:
Each single factor alone is incomplete; practical designs consider all simultaneously.

Common Pitfalls:
Confusing 'pavement' (surfaced carriageway) with 'roadway'; medians are not traffic lanes but they add width.

Final Answer:
all the above