The term 'speed deterrent' can be summarized by the crossword solution 'BUMP'. A BUMP is a raised area on a road surface that is designed to slow down vehicles. It is usually placed at intersections or other areas where drivers may be tempted to speed. Bumps are also known as speed humps, speed bumps, or sleeping policemen. They are an effective way to reduce the speed of vehicles and make roads safer for pedestrians and other drivers.