The MUTCD prescribes several Horizontal Alignment signs to give drivers advance warning of a horizontal curve, as illustrated in Figure 20.įor a single curve section, use one of these four signs in advance of the curve:įor sections with more than one curve in close proximity, use one of these three warning signs in advance of the first curve:įigure 20. Warning signs call attention to unexpected conditions on or adjacent to a roadway. BASIC SIGNING COUNTERMEASURES Advance Warning Signs The following discussion provides a summary of basic and enhanced signage, followed by a discussion on maintenance considerations applicable to signs. If the problem is not resolved by using a uniform application, then additional devices should be considered. Providing uniformity may be all that is necessary to address an identified safety concern. The assessment may reveal unnecessary devices that should be removed, improperly placed devices that should be moved, or required or recommended devices that are missing. The decision to add one or more of the other basic or enhanced treatments at a specific curve will be influenced by the factors noted above, but should be prefaced by an assessment at the system and corridor level. Many curves need only the basic horizontal alignment warning signs. A sudden change in alignment after many miles of consistently straight roadway.Unexpected geometric features within the curve, such as an intersection, change in grade, change in curve radius, or visual cues that contradict the roadway alignment.Geometric features of the curve to include its length, radius, shoulders and roadside features.The difference between the posted speed limit and recommended advisory speed.The MUTCD requires that the use of warning signs shall be based on an engineering study or engineering judgment. The MUTCD provides specific recommendations and requirements for uniform application of many of these basic devices. This uniformity provides drivers with a consistent message on which to base their expectations. There are several signing options that road agencies should consider installing at a horizontal curve, especially curves with attributes that data or experience identify as potentially problematic.Īgencies should apply signing devices uniformly, based on the sharpness of the curve.
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