Little Rock installed trolley tracks and trolleys in its downtown & River Market areas in 2004. This is a pretty high-traffic area, with very narrow (10-foot) traffic lanes. On long stretches of street it makes it nearly impossible for bikes, since you simply have no place to go, and no space to get your wheels perpendicular to the tracks to cross them. I've lost count of how many diverting falls, broken collarbones, and other fractures these things have caused. I will ride a couple blocks out of the way to avoid these things...