Plowing in Winter perhaps?

Yep, plowing and speed bumps don't mix. My workplace bought removable speed bumps. At the first snow, they maintenance folks unscrew the speed bumps from the roads / parking lot that are owned by the college. When the snow melts, they put back the speed bumps. Also, speed bumps with ice accumulations are just nasty.

Where I live they sometimes put a series of raised "vibrating" white strips before a crossing. In some places it's even only painted lines.