If a truck looms out of the blindspot during a high-speed freeway merge, for example, a driver would be better off if his phone's ringer was disabled at that moment, he says.
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 blindspot or slow for a red light up ahead that another driver isn't heeding.