speed bump(n = noun.artifact) - a hindrance to speeding created by a crosswise ridge in the surface of a roadway;
is a kind of encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventative, preventive

air speed, bump, bump around, bump into, bump off, bump up, execution speed, goose bump, light speed, speed, speed cop, speed counter, speed demon, speed freak, speed indicator, speed limit, speed of light, speed of sound, speed skate, speed skater, speed skating, speed trap, speed up, warp speed