A high-efficiency apparatus for real time measuring of parameters and operational times of vehicles running around a racetrack. At least one detecting station is arranged at a location along the racetrack and is set up to both receive and transmit radio frequency (RF) signals both from/to a transceiver...http://www.google.ca/patents/US5666101?utm_source=gb-gplus-sharePatent US5666101 - High-efficiency apparatus for measuring operational parameters and times of vehicles running around a racetrack
