What is the standard width of a traffic lane?

[NatalieFitz]

The standard width of a traffic lane ranges from 2.8 to 3.75 meters, varying under different road conditions. Design conditions for 3.75 meters: Applicable to urban expressways, arterial roads, and mixed traffic lanes for large vehicles with a design speed exceeding 60km/h. Design conditions for 3.50 meters: Applicable to general urban roads (excluding expressways) where mixed traffic lanes for large vehicles have a design speed below 60km/h, or dedicated lanes for small vehicles with a design speed above 60km/h, as well as urban road intersections and exit lanes for mixed traffic of large vehicles. Design conditions for 3.25 meters: Applicable to dedicated lanes for small vehicles on general urban roads or the minimum width for exit lanes of dedicated small vehicle lanes at reconstructed intersections.