With help from signals from roadside markers and traffic lights, in-car computers will be able to determine if a car should slam on the brakes, alert the driver to a passing vehicle in the blind spot or slow for a red light up ahead that another driver isn't heeding.
The app was initiated by Roger and his wife Margaret, both from the North of England, who got in touch with an app maker to carefully develop the idea over the last 18 months, passing through several months of testing with other blind users.