Dr. Albert Burg and the U.C.L.A. Institute of Transportation and Traffic Engineering. A bibliography follows the information found herein. To communicate, outdoor signing must register from a distance, when people are in motion. Failure to recognize the effect of a person's rate of motion upon the design considerations for an outdoor sign, can result in an ineffective communication. The distance at which a sign must read is in part determined by the rate and type of motion.
Pedestrian motion is characterized by a wide range of variable sensory stimuli.
These involve frequent focal points with many highly differentiated spaces and objects. Vehicular arteries are characterized by generally larger scale sensory stimuli consisting of free-flowing forms, widely spaced. Objects and spaces are more difficult to comprehend from a vehicle than when one is a pedestrian. A definite difference exists between the perceptual processes of the driver and the pedestrian. Basically, it is one of involvement.