Chapter 1360
Interchanges
WSDOT Design Manual M 22-01.20
Page 1360-8
September 2021
Cross slope and superelevation criteria for ramp traveled ways and shoulders are as given in Chapter 1250 for
roadways. At ramp terminals, the intersection lane and shoulder width design guidance shown in Chapter 1310
may be used.
Whenever feasible, make the ramp cross slope at the ramp beginning or ending station equal to the cross slope
of the through lane pavement. Where space is limited and superelevation runoff is long, or when parallel
connections are used, the superelevation transition may be ended beyond (for on-ramps) or begun in advance
of (for off-ramps) the ramp beginning or ending station, provided that the algebraic difference in cross slope at
the edge of the through lane and the cross slope of the ramp does not exceed 4%. In such cases, provide smooth
transitions for the edge of traveled way.
Exhibit 1360-6 Ramp Widths
Number of Lanes
1
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