This plan provides the necessary details for installing a Signal Standard.
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In any WSDOT contract requiring the installation of a Signal Standard, include this plan sheet as part of the Contract Plans: View Memorandum (pdf 88 kb)
These details were developed by the Bridge and Structures Office, and the original drawing, signed by a Structural Engineer, is on file at the HQ Design Office. Specific project information may be inserted in the sheet borders, but any modification to the details or notes will require approval by a licensed Structural Engineer. A copy of the filed original is provided for comparison: View Signed Plan Sheet (pdf 1.3 mb)
In the above memorandum, Region Electrical Design Groups need to contact the Region Materials Engineer and request foundation recommendations. The Region Materials Engineer will assess the site soils and topography for the proposed signal location. Based on their assessment, there are two options. First, if soil conditions and slopes are such that a standard foundation can be used, the Region Materials Engineer will recommend to the Region Electrical Design Group that they use a standard foundation consisting of:
View Plan Sheet (pdf 412 kb)
If soil conditions are too soft or the slopes are too steep, the Region Materials Engineer will recommend using a special foundation design. At this point, the Region Materials Engineer may, elect to provide the foundation design recommendations to Bridge and Structures themselves, or the engineer may request the HQ Geotechnical Division to provide the design recommendations to the Bridge and Structures Office. In either case, Bridge will do the Special Foundation Design.
In no case should an individual from the Region Electrical Design Group select a standard foundation for use without the recommendation and concurrence of the Region Materials Engineer.
Per the above memorandum, Region Electrical Design Groups are directed to request a soils analysis, in memorandum format, from the Region Materials Engineer. Please note the highlights, representing the particular information to be included for each project, in the following sample:
View sample of Soils Analysis Request Memo (pdf 20 kb)
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