All traffic signal equipment mounted on supporting structures other than span wire, including flashing or illuminated signs and their controls, shall be located to provide a clearance of at least 10 feet wherever possible and a minimum of 5 feet from utility poles. If a pole of a public service company is to be used as a riser pole, rigid metal conduit shall be installed from the signal equipment to the pole and up to the point of attachment of the weatherhead as outlined elsewhere in these instructions.
Conn. Agencies Regs. § 16-243-1