The term 'Speeder Spotter' refers to a person who uses RADAR to detect vehicles that are travelling at excessive speeds. This job requires the use of specialized equipment such as RADAR guns to measure the speed of oncoming vehicles and alert law enforcement if necessary. The crossword solution for this term is RADAR, which is an acronym for Radio Detection and Ranging. RADAR is a detection system that uses radio waves to determine the range, angle, or velocity of objects.