What is the correct definition of "Traffic lane"?

What is the correct definition of "Traffic lane"?

1. The trunk of the road where all types of vehicles can travel back and forth.
2. The trunk of the road divided into two traffic directions, half left and half right.
3. A part of the roadway, divided by lines or road dividers along the roadway, with sufficient width to allow vehicles of all types to travel in one lane.

Correct answer

A part of the roadway, divided by lines or road dividers along the roadway, with sufficient width to allow vehicles of all types to travel in one lane.

This is the correct answer for the Cambodian driving theory test. Questions are drawn from the official Ministry of Public Works and Transport sign library and road rules.