With three sensors rather than theusual two or four, the Quanan offers motorists everything they need from a reversing aid. The countdown display was startlingly accurate and the car pictogram to the right of this showed which sensor was doing most work- and thus where any obstacle was likely to be. A warning was not sounded until 1.5m away, which is just about right for Britain's often tight parking bays. Performance in both the carand bollard tests was perfect and the Quanan managed to spot the bicycle from 60cm away.