WSDOT Design Manual M 22-01.20
Page 1360-1
September 2021
Chapter 1360
Interchanges
1360.01 General
1360.02 Interchange Design
1360.03 Ramps
1360.04 Interchange Connections
1360.05 Ramp Terminal Intersections at Crossroads
1360.06 Interchanges on Two-Lane Highways
1360.07 Interchange Plans for Approval
1360.08 Documentation
1360.09 References
Exhibit 1360-1 Basic Interchange Patterns
Exhibit 1360-2 Interchange Spacing
Exhibit 1360-3 Minimum Ramp Connection Spacing
Exhibit 1360-4 Ramp Design Speed
Exhibit 1360-5 Maximum Ramp Grade
Exhibit 1360-6 Ramp Widths
Exhibit 1360-7 Lane Balance
Exhibit 1360-8 Lane Balance
Exhibit 1360-9 Main Line Lane Reduction Alternatives
Exhibit 1360-10 Acceleration Lane Length
Exhibit 1360-11 Deceleration Lane Length
Exhibit 1360-12 Gore Area Characteristics
Exhibit 1360-13 Gore Area Characteristics
Exhibit 1360-14 Length of Weaving Sections
Exhibit 1360-15 On-Connection: Single-Lane, Tapered
Exhibit 1360-16 On-Connection: Single-Lane, Parallel
Exhibit 1360-17 On-Connection: Two-Lane, Parallel
Exhibit 1360-18 On-Connection: Two-Lane, Tapered
Exhibit 1360-19 Off-Connection: Single-Lane, Tapered
Exhibit 1360-20 Off-Connection: Single-Lane, Parallel
Exhibit 1360-21 Off-Connection: Single-Lane, One-Lane
Reduction
Exhibit 1360-22 Off-Connection: Two-Lane, Tapered
Exhibit 1360-23 Off-Connection: Two-Lane, Parallel
Exhibit 1360-24 Collector-Distributor: Outer Separations
Exhibit 1360-25 Collector Distributor: Off-Connections
Exhibit 1360-26 Collector Distributor: On-Connections
Exhibit 1360-27 Loop Ramp Connections
Exhibit 1360-28 Temporary Ramps
Exhibit 1360-29 Interchange Plan
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