6.8.12 Tram Detection
Three methods of tram detection are currently in use:
- Loops: Trams in a dedicated lane may be detected by inductive loops placed between the rails. They may produce passage or presence actuations.
- Transponder/transmitter systems: In a mixed traffic lane, inductive loops do not uniquely identify trams. Transponder or transmitter systems as described above for buses can be used.
- Skates: Skates are overhead contacts in the energy supply lines to the tram. As the tram pickup passes, a momentary isolated contact closure is transmitted to the controller. These perform a locked call function only. This method of detection is now rarely used.