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Chapter 1250 Cross Slope and Superelevation

WSDOT Design Manual M Page 1250-1 September 2021 Chapter 1250 Cross Slope and Superelevation General Roadway Cross Slope Superelevation Rate Selection Existing Curves Turning Movements at Intersections Runoff for Highway Curves Runoff for Ramp Curves Documentation References Exhibit 1250-1 Minimum Radius for Normal Crown Section Exhibit 1250-2 Minimum Radius for Existing Curves Exhibit 1250-3 Side Friction Factor Exhibit 1250-4 Superelevation Rates (10% Max) Exhibit 1250-5 Superelevation Rates (8% Max) Exhibit 1250-6 Superelevation Rates (6% Max) Exhibit 1250-7 Superelevation Rates for Intersections and Urban Roadways 40 mph and slower Exhibit 1250-8 Superelevation Transitions for Highway Curves Exhibit 1250-9 Superelevation Transitions for Highway Curv

increased traffic volumes decrease the number and size of available passing opportunities. ... limit superelevation from the selected chart to 6% or less. In these areas, provide justification for superelevation rates greater than 6%. ... 0 1,000 2,000 3,000 4,000 5,000 S u p e r e l e v a t i o n (%) 4 5 m p h 4 0 m p h 3 5 m p h 3 0 m p h 2 5 ...

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Transcription of Chapter 1250 Cross Slope and Superelevation

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