1. Aspects of the history of traffic signals;Mueller;IEEE Transact Vehicul Technol,1971
2. For and against semi-actuated traffic signal control;Ficklin;Traffic Eng, Inst Traffic Engr,1973
3. The Sydney Coordinated Adaptive Traffic (Scat) system philosophy and benefits;Sims;IEEE Transact Vehicul Technol,1980
4. Raymond Marcy. Apparatus for monitoring road traffic to control an associated signalling system. US Patent No. 4390951, June 1983.
5. Sumner, Roy L. Cell messaging process for an in-vehicle traffic congestion information system. US Patent No. US0005182555A; January 1993.