Final Answer:
You may drive over 4" couplings when the overall height of the roadway or surface does not exceed 4 inches.
Step-by-step explanation:
The ability to drive over 4" couplings is contingent upon the height of the roadway or surface. 4" couplings are typically found in the road, especially in construction zones. Drivers are allowed to drive over these couplings when the overall height of the roadway or surface does not exceed 4 inches. This provision ensures that vehicles can safely traverse over such couplings without causing damage to the vehicle or the road infrastructure. It is important for drivers to be aware of the road conditions and any potential obstacles, including couplings, to ensure safe and smooth navigation.