manual light control

The Ohio Manual of Uniform Traffic Control Devices (abbreviated OMUTCD) is the standard for traffic signs, road surface markings, and traffic signals in the U.S. state of Ohio. It is developed by the Ohio Department of Transportation's Office of Roadway Engineering "in substantial conformance to" the national Manual on Uniform Traffic Control Devices developed by the Federal Highway Administration. The first edition of the OMUTCD was published in 1924; the most recent edition was published in 2012. Ohio is one of ten states that publish their own editions of the MUTCD.
The OMUTCD defines the content and placement of traffic signs. Design specifications are detailed in a separate document, the Sign Designs & Markings Manual (SDMM), which mirrors the national Standard Highway Signs and Markings (SHSM) document. A third document, the Traffic Engineering Manual (TEM), codifies ODOT's traffic engineering best practices, which local jurisdictions are encouraged to use as a reference. The OMUTCD includes references to both documents. The OMUTCD is a large document on its own, measuring about 2 inches (51 mm) thick.

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