United States Department of Transportation
i
An Evaluation of Warning and Regulatory Signs for Curves on Rural Roads
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1980-03-01
[PDF-1.58 MB]
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Edition:Final Report
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Abstract:The report reviews an experiment undertaken to examine the effectiveness of five sign treatments for controlling driver speeds in the vicinity of hazardous horizontal curves on rural two-lane highways. Signs examined ranged from the standard curve warning arrow to a regulatory speed zone sign in conjunction with a curve warning sign. Data collected during the experiment included both the following electronic and manual data: speeds of motorists as they approached and negotiated two horizontal curves, vehicle classification and registration information, and whether vehicles crossed over center and edge line markings. Data were collected under both day and night conditions and under adverse weather conditions. The principle findings were that no sign, or group of signs, were consistently more effective than another relative to decreasing the potential hazard at horizontal curves in rural two-lane situations. Because the report clearly shows that the experiment was well conceived, the reasons for the above results are not immediately clear. It may well be, however, that the proliferation of curve warning signs has lessened the average motorist's respect for the message they convey.
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