The signalling system of the 182 km new high-speed line conforms with the requirements of European Rail Traffic Management System (ERTMS) Level 2, while the 32 km of conventional connections are equipped with ERTMS Level 1-standard signalling instead. As such, LGV Bretagne-Pays de la Loire does not feature any conventional visual line-side signals, this information being communicated to drivers using in-cab screens instead. A combination of Radio Block Centres (RBC) and Eurobalises are installed at intervals throughout the length of the line to allow for the continuous delivery of this information to trains, which is wirelessly transmitted using the Global System for Mobile Communications – Railway (GSM-R) communication standard. Under normal conditions, all of the line's signalling is centrally controlled via a switching centre located at Rennes.