2. CBTC system principles

2.1 Reminder of signalling system functions

The functions of the signalling system are classically grouped into three subsets:

• traffic organization, supervision and regulation;

• interlocking functions ;

• speed control and regulation functions.

• Traffic organization, supervision and regulation

  These functions enable operators to run the line or metro network from the supervision center. Traffic is organized – off-line preparation of the timetable to be run –, then supervised in real time to adapt to the conditions encountered (passenger incidents, breakdowns, increased demand for transport...