This study reviews the practice of erecting signs to warn drivers that they are approaching a substandard curve and also the setting and signing of curve advisory speeds. The study (which includes information from Australia and 23 other countries) develops a number of options and conclusions relating to the future use of such signs. The study concludes that curve advisory speeds are generally extremely conservative. However, possible safety implications in increasing these advisory speeds would appear to rule out a major change in the basic criteria for setting curve advisory speeds. Instead it is considered more important to encourage the consistent setting of curve advisory speeds across Australia. The report also suggests that improving delineation on some curves would possibly enable advisory speed signs on these curves to be removed. (A)
Abstract