Effects of illumination on operating characteristics of freeways

In part I, observations on the traffic stream made under two intensities of artifical illumination and under daylight conditions are studied along with an analysis of the accident rate under day and night conditions over a 5 year period. Part II centers upon the individual driver and his performance in controlling his vehicle under different nighttime illumination levels. The subjects drove an instrumented vehicle equipped with an oscillograph recorder and sensors for velocity, steering, and gas pedal movements. Part III deals with the instrumentation of the vehicle. Part IV pertains to the area of driver apprehension, the effects of illumination change upon visual phenomena and driver responses and the effects upon traffic flow, driver behavior, and accidents.