The sign "Prohibition for vehicles over specified actual height" indicates that vehicles taller than a certain height are not allowed to pass through that area. This restriction is usually in place to protect structures such as bridges or other overhead installations that could be damaged by taller vehicles.

The height limit is indicated on the sign, typically in centimeters or meters, so drivers need to assess their vehicle's height before proceeding. It's important to follow this sign to avoid accidents and potential fines, as well as to ensure the safety of both the vehicle and the infrastructure.