Passenger Car and Truck Signaling and Marking Research: I. Regulations, Intensity Requirements and Color Filter Characteristics

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Passenger Car and Truck Signaling and Marking Research: I. Regulations, Intensity Requirements and Color Filter Characteristics

R. G. Mortimer / C. D. Moore / C. M. Jorgeson / J. K. Thomas

The report describes some of the studies conducted in a program of research in automobile and truck marking and signaling. A detailed summary of current U.S. vehicle marking and signaling lighting standards was prepared, and compared with the main features of foreign vehicle marking and signaling standards. These reviews suggested a number of topics that warrant further consideration such as area-intensity relationships of stop and turn lamps, the hazard warning (four-way flashing) signal being rendered inoperative if the brake pedal is depressed, reduced photometric and location requirements of rear turn signals on tractors, tractor cleanance lamps indicating cab width rather that the width of the vehicle, the adoption of side turn signal lamps, white for front parking lamps, use of yellow for rear turn signal lamps, etc. The final study in this report was a laboratory evaluation of color discrimination and identification by normal and dichromatic observers, on the basis of which preliminary recommendations for chromaticity coordinated of red, yellow and green-blue lamp filters were derived.