From Longman Dictionary of Contemporary Englishspeed bumpˈspeed bump (also speed hump British English) noun [countable] TTRa narrow raised area put across a road to force traffic to go slowly SYN sleeping policeman
Examples from the Corpus
speed bump• In the big picture, the Rams were nothing more than a speed bump on the road toward the Super Bowl.• Internet advertising, until recently flourishing, is hitting its first speed bump.• It stopped an admiring eye like a visual speed bump. 