Second improving safety. Human error is a factor in most collisions. Failing to look properly, misjudge other road users’ movements, being distracted, careless or in too much of a hurry are the most common causes of collisions on our roads, according to the report. Automated vehicles will not make these mistakes. They use a range of sensors which will constantly monitor their surroundings. Driverless cars will be required to obey all road traffic laws and The Highway Code and are expected to substantially reduce collisions, deaths and injuries.