What is the basic lane width appropriate for national roads?

The basic lane width appropriate for national roads is typically set at 3.35 meters. This width is established to ensure safe and efficient vehicle operation, accommodating a wide range of vehicle dimensions and types, including larger vehicles such as trucks and buses that frequent these roads. A lane width of 3.35 meters provides sufficient space for vehicles to maneuver safely, reducing the risk of side-swipe collisions and allowing for comfortable travel for all road users.

The choice of lane width directly impacts road safety and traffic flow efficiency, explaining why guidelines recommend 3.35 meters as a standard for national roads. This width helps in maintaining adequate clearance between passing vehicles and offers enough room to accommodate various driving conditions, including curves and lane changes, enhancing overall road usability.

In contrast, narrower lane widths can lead to increased accident risks and discomfort for drivers, while excessively wide lanes may encourage speeding and result in a less controlled environment. Therefore, 3.35 meters has been established as a suitable compromise by various transportation authorities and design standards.