What should be done if unsure about having enough overhead clearance while driving?

Answer: B — Find another route without overhead obstructions

Choosing to find another route without overhead obstructions is the most prudent approach when unsure about overhead clearance. This option prioritizes safety by allowing the driver to avoid potentially hazardous situations that could arise from misjudging clearance heights. Overhead obstructions can pose serious risks, such as damaging the vehicle or getting stuck, which could lead to further complications or delays. By opting for a safer route, the driver effectively reduces the risk of an accident and ensures a smoother travel experience. Additionally, planning for routes that are known to be free of such obstructions is a good practice in general, especially for commercial drivers who need to be mindful of vehicle dimensions and potential hazards on the road.