Why is it critical for a driver to know their vehicle's height?

Knowing a vehicle's height is crucial for avoiding collisions with low bridges or overhead structures. Height clearance is a vital consideration for all drivers, particularly those operating larger vehicles, such as trucks and buses. These vehicles often encounter areas with restricted vertical clearance, and misjudgment can lead to serious accidents, including damaging the vehicle and infrastructure.

When a driver is aware of their vehicle's height, they can better navigate routes that are safe and suitable, avoiding hazards that could result in catastrophic collisions. This awareness not only protects the vehicle and driver but also ensures the safety of other road users and the integrity of public infrastructure.

The other options do touch on important aspects of vehicle operation but do not prioritize the immediate safety concern related to vehicle height in the context of navigating under overpasses or through tunnels. Fuel efficiency, performance, and parking space considerations are all significant but are secondary to the imperative need for height awareness to prevent accidents and ensure safe travel.