In Orlando, FL they installed the round-abouts. True you had to slow down to get around them but it was a real pain for the fire engines to get around them as they are long. Though it did keep out the tractor trailers from using it as a pass-thru. Too many drunks though forgot about these "bumps in the road" and tried to drive right thru them. Needless to say, they didn't make it...............teehee.