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Left 180 Degree (Hairpin) Curve is a MUTCD compliant (MUTCD W1-11L) and indicate a very sharp left turn. Left 180 Degree (Hairpin) Curves are useful devices to help display warnings and provide mandatory information to drivers and pedestrians on both public and private roadways.
Compliance
Section 2C.07 Horizontal Alignment Signs
Option
- If the curve has a change in horizontal alignment of 135 degrees or more, the Hairpin Curve (W1-11) sign may be used instead of a Curve or Turn sign.
Source: 2009 MUTCD