Tompkins County, NY has painted the shoulders on a section of Ellis Hollow Road green. They hope the green shoulders will make the road feel narrower and slow down traffic. Below is a local TV news story about the project (link to Channel 9).
Painting the shoulders on the 1.5 mile section cost about $17,500. The paint should last about five years.
The county is in the middle of performing a before/after speed study to determine if the project is effective in slowing down traffic. I applaud this kind of innovative experimentation. It cost some money to paint the shoulders after the fact, but the cost would have been negligible if it was part of the initial repaving project.