Graduate Thesis Or Dissertation
 

Effectiveness of curve advisory speed signs : a characterization of road operations in western Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d504rq58v

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  • Posting advisory speed signs at sharp horizontal curve locations is a common practice in the U.S. These signs recommend drivers safe speeds to negotiate such curves. Literature indicates that adherence to advisory speeds is, in general, poor. Moreover, limited research is available that quantifies safety implications of these signs. This thesis focuses on assessing effectiveness of advisory speed signs at two-lane rural highways in western Oregon. This objective is achieved by categorizing road operations at horizontal curves that display advisory speed signs. The findings provide evidence of a generalized lack of adherence to advisory speeds. It is estimated that, on average, drivers in western Oregon exceed advisory speeds by 13.8 mph. However, it was not possible to identify any other significant effects of these signs over road operations. Since the study sample of sites represents a relevant portion of the state of Oregon, the author expects that these results are useful at the state policy making level.
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