In the UK, cars are required to pass an annual safety inspection, known as an MOT. One of the things that an MOT inspector will look for is rust. If the rust is severe enough, the car could fail the inspection.
The severity of the rust will be assessed by the MOT inspector. They will look for things like:
* The size of the rust patches
* The location of the rust patches
* The depth of the rust patches
* The presence of any holes in the metal
If the inspector determines that the rust is too severe, they will fail the car. This means that the car will not be allowed to be driven on public roads until the rust has been repaired.
If you're concerned about rust on your car, it's best to have it inspected by a qualified mechanic. They can assess the severity of the rust and let you know if you need to have it repaired.