Drivers were observed and questioned and their responses were measured as they unexpectedly came upon do not enter signs while driving in the driving simulation laboratory. Red and white signs elicited an earlier response than did the black-and-white signs, and more drivers responded correctly to the red-and-white signs. This finding was cross-validated by tests at another location. A second set of signs was tested at the second location. Results at this writing are not conclusive regarding the relative enforceability of the four different messages. Preliminary evaluation was made of the appearance of laneline arrowheads painted on every fourth dashed line of an otherwise standard lane marking. The arrowheads were oriented in the direction of normal flow, so that a wrong-way driver would encounter a series of arrows with their points facing him. This particular type of lane-line arrow marking was judged not sufficiently noticeable to alert a wrong-way driver. Observations were made of several styles of pavement marking arrows. When approaching them from the pointed end, as a wrong-way driver would in attempting to enter an off-ramp, the standard arrows /which originally were developed as directional guides/ are not as detectable as two different styles. (Author/Publisher)
Samenvatting