Additional Details
Horizontal Alignment Signs (W1-1 through W1-5)
The horizontal alignment Turn for 30 mph or less (W1-1), Curve over 30mph (W1-2), Reverse Turn less than 30 mph (W1-3), Reverse Curve over 30 mph (W1-4), or Winding Road (W1-5) signs may be used in advance of situations where the horizontal roadway alignment changes.
An Advisory Speed plaque may be used to indicate the speed for the change in horizontal alignment. A supplemental distance plaque (Next XX Miles) may be installed below the Winding Road sign where continuous roadway curves exist.
MUTCD -Section 2C.01 Function of Warning Signs
Standard: The use of warning signs shall be based on an engineering study or on engineering judgment.
Guidance:
Warning signs should be placed so that they provide adequate PIEV time. Warning signs should not be placed too far in advance of the condition, such that drivers might tend to forget the warning because of other driving distractions, especially in urban areas.Minimum spacing between warning signs with different messages should be based on the estimated PIEV time for driver comprehension of and reaction to the second sign.The effectiveness of the placement of warning signs should be periodically evaluated under both day and
night conditions.The use of warning signs should be kept to a minimum as the unnecessary use of warning signs tends to breed disrespect for all signs. In situations where the condition or activity is seasonal or temporary, the warning sign should be removed or covered when the condition or activity does not exist.
Support:Warning signs call attention to unexpected conditions on or adjacent to a highway or street and to situations that might not be readily apparent to road users. Warning signs alert road users to conditions that might call for a reduction of speed or an action in the interest of safety and efficient traffic operations.
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