Motor Vehicle Exterior Lighting

A review is made of recent research, primarily by the author and his colleagues, concerned with vehicle marking and signaling and headlighting. Insofar as vehicle marking and signaling is concerned, it was concluded that the most effective likely approach to the reduction of rear-end crashes would come from development of a suitable display of the speed of a vehicle which is visible to drivers of following vehicles. Further improvements in headlighting, other than polarization, which will be dependent upon concomitant reductions in errors in headlamp aim and alignment, can be expected to take the form of three-beam headlighting systems incorporating a low or city driving beam, a mid beam, and a high beam.