 It will read road signs, and in Europe and Northern Ireland, the device will actually limit a driver's speed. In the UK, the device will sound an alarm if the driver is speeding. That's because the mandate doesn't apply in post-Brexit Britain. But since cars will be made for distribution Europe-wide, cars sold in Britain will be equipped with the intelligent speed assistance system. It just won't be active, though very few believe that the UK will be immune for long.