It's called Smart Wheel, and it's designed to fit over the steering wheel of most standard vehicles to track whether or not the driver has two hands on the wheel at all times.

TRW Conekt led a safety analysis programme of the prototype vehicle, which went through tests on braking and steering systems among other things on Lotus test track near Norwich.

Steering off the known track is risky, and we are terrified of what might happen if we do.