Note: Include the following plan sheet(s) (as applicable) as part of the Contract Plans for any WSDOT Contract requiring the installation of any of the following Signal Standard Types:
Conventional Signal Standard Design (IS-13)
This plan provides the necessary details for installing conventional Signal Standards (Type PPB, PS, I, II, and III).
View Plan Sheet (pdf 53 kb)
Type II or III Signal Standards with double arms at angles other than 90 degrees requires design support from the Bridge and Structures Office.
Ramp Meter Signal Standard Design (IS-13A)
This plan provides the necessary details for installing Signal Standards used in Ramp Meter Systems (Type RM, FB, and II).
View Plan Sheet (pdf 44 kb)
Rectangular Rapid Flashing Beacon (RRFB) System Standard Design (IS-13B)
This plan provides the necessary details for installing Signal Standards used in RRFB Systems (Type FB and II).
View Plan Sheet (pdf 51 kb)
Per the "Soil Investigation in the Signal Design Process" memorandum, Region electrical design groups need to contact the Region Materials Engineer (RME) and request soil condition data and foundation recommendations. The RME will assess the site's soils and topography for the proposed Signal Standard location. View Memorandum (pdf 88 kb).
Based on the RME's assessment, there are two options:
1. If the soil conditions and slopes are such that a standard foundation design can be used, the RME will recommend to the Region electrical design group that the foundation depth be designed using the criteria contained within the applicable Standard Plan. Foundation depths shall be obtained from Standard Plan J-26.10 using the criteria contained therein.
View Standard Plan J-26.10 (pdf 64 kb)
Standard Plan J-26.10 Foundation Construction Methods:
||Alternate 2 (backfill material not shown)|
2. If soil conditions or slopes will not allow for the use of a standard foundation design (such as soils that are too soft, loose or solid rock is encountered, or the slopes are too steep), the RME will recommend using a special foundation design. At this point, the RME may elect to provide the foundation design recommendations directly to the Bridge and Structures Office or request that the HQ Geotechnical Division provide the recommendations to the Bridge and Structures Office. In either case, the Bridge and Structures Office will be responsible for the development of 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 RME.
Per the above memorandum, Region electrical design groups are directed to request a soils analysis, in memorandum format, from the RME. Please note the highlights, representing the specific information to be included for each project, in the provided template. View Soils Analysis Request Memo (pdf 20 kb)
Download IS-13 WinZip file (zip 5 mb)
Download IS-13A WinZip file (zip 5 mb)
Download IS-13B WinZip file (zip 5 mb)
(WinZip file contains the following file formats: .dgn, .dwg, and .doc files)
Download free Adobe Acrobat Reader
Download free evaluation version of WinZip