The **circulation width** of special vehicles is what is considered for the purpose of traveling on public roads. This is because there are **specific regulations** that govern the maximum allowed dimensions for vehicles on public roads. For example, the maximum allowed width for a vehicle, including its load, is **2.55 meters**. This measurement is crucial to ensure safety and the proper flow of traffic on the roads.


Additionally, in situations where the road is narrow, a **priority order** is established to determine which vehicle has the right of way. Special vehicles that exceed the established dimensions have priority over other types of vehicles. This reinforces the importance of considering the circulation width according to traffic regulations, rather than the actual width of the vehicle or any other measurement.

Therefore, the width considered for circulation is the one regulated by traffic norms, ensuring that all vehicles can travel safely and orderly on public roads.