JiK... "but as used they really clog things up and produce a lot of accidents."

My city has just spent a tad over $3M for one small one. $360k for the engineering consultant. I'd guess the office and field engineering at $80k, give or take a buck, so we paid at least $250k for someone to draw a fuckin circle. The biggest selling point was less accidents and no t-bone accidents*. My take is that the biggest selling point was $ under the table.

* Apparently, the city and the engineers are not aware of the fact that it often snows (and rains) and freezes up in this neck of the woods for at least four months a year. Dumbasses the lot.