Chapter 1360
Interchanges
WSDOT Design Manual M 22-01.20
Page 1360-23
September 2021
Include the following, as applicable:
• Design speeds (see Chapter 1103) for main line and crossroads.
•
Curve data on main line, ramps, and crossroads.
• Numbers of lanes and widths of lanes and shoulders on main line, crossroads, and ramps.
• Superelevation diagrams for the main line, the crossroad, and all ramps; these may be submitted on
separate sheets.
• Channelization.
• Stationing of ramp connections and channelization.
• Proposed right of way and access control treatment (see Chapter 510, Chapter 520, and Chapter 530).
• Delineation of all crossroads, existing and realigned.
• Traffic data for the proposed design; include all movements.
• For HOV direct access connections on the left, include the statement that the connection will be used
solely by HOVs or will be closed.
Prepare a preliminary contour grading plan for each completed interchange. Show the desired contours of the
completed interchange, including details of basic land formation, slopes, graded areas, or other special features.
Coordinate the contour grading with the drainage design and the roadside development plan.
1360.08
Documentation
Refer to Chapter 300 for design documentation requirements.
1360.09
References
1360.09(1) Design Guidance
Manual on Uniform Traffic Control Devices for Streets and Highways
, USDOT, FHWA; as adopted and modified
by Chapter 468-95 WAC “Manual on uniform traffic control devices for streets and highways” (MUTCD)
Plans Preparation Manual
, M 22-31, WSDOT
Standard Plans for Road, Bridge, and Municipal Construction
(Standard Plans), M 21 01, WSDOT
Standard Specifications for Road, Bridge, and Municipal Construction
(Standard Specifications), M 41-10, WSDOT
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