Adrian Flux said said its policy would be updated as both the liability debate and driverless technology evolved. It is estimated that human error is at least partly responsible for more than 90% of current road fatalities. As a result, a move to self-driving cars is expected to reduce car insurance premiums in the long term. Norfolk-based Adrian Flux, which has 600,000 customers, said that with the potential reduction in accidents, the new policy could be cheaper than standard ones, although other factors, such as location and overnight parking, remained important.