What should drivers do when they see a Low Bridge sign?

When drivers see a Low Bridge sign, the appropriate action is to check the vehicle's height before proceeding. This sign serves as a warning that the clearance under the bridge is limited, and it's essential for drivers to ensure that their vehicle can safely pass beneath it without risking collision.

By checking the vehicle's height, drivers can make informed decisions about whether to proceed or find an alternate route if their vehicle exceeds the height limit indicated by the sign. This precaution helps to prevent accidents and damage to both the vehicle and the bridge, maintaining safety for all road users.

The other choices do not adequately address the risks associated with a low bridge. Increasing speed could lead to a dangerous situation if a driver miscalculates their vehicle's height relative to the bridge. Preparing to stop for a gate may not be relevant to a low bridge scenario, and ignoring the sign could have serious consequences, especially for drivers of taller vehicles, as it puts both the driver and infrastructure at risk.