speed bump
noun [ C or ] uk/ˈspiːd ˌbʌmp/ us/ˈspiːd ˌbʌmp/ (UK also speed hump); (sleeping policeman)
（设在路面上的）减速垄
a small raised area built across a road to force people to drive more slowly
Local residents are asking for speed bumps to be installed in their street. 当地居民要求在街道上安装减速垄。