You'll still need to forge a relationship with your local public works, traffic, or town councilor or selectman to make headway on getting bike-friendly signs or sharrows installed, but once you've done that, here's some information for practical next steps.
The bike friendly signs and sharrows are from the Manual on Uniform traffic Control devices, the MUTCD. (http://mutcd.fhwa.dot.gov/ or Part 9 of that resource here.
If signs are used as described in the MUTCD they are legal. There is no “3 feet, It’s the Law” official signage. There is an official “Bikes May Use full Lane” sign. So the MUTCD is where to go to find out what kind of signs can be used. Then they can be purchased or made by the town in its sign shop (if it has one). Any sign supplier that the Town uses should be able to supply these signs.
For other Share the Road resources, see the DOT's page at http://www.ct.gov/dot/cwp/view.asp?a=2314&q=433254.
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