The regulator sets standards for testing driving assist systems, specifically focusing on the misrate of the system, which measures the rate at which the system fails to activate the brakes when it should. These tests are conducted on a test track and aim to achieve a success rate of 80% or 90% in emergency braking. However, the regulator does not measure the fault rate, as it requires statistical analysis which is not possible on a test track. The responsibility of measuring the fault rate lies with the car makers, as they do not want to introduce a faulty system that would create an uncomfortable and scary experience for the driver, with unexpected false braking occurrences.