The east-west Line 3 is 19.8km long and runs from Juvignac to Pérols Etang de l'Or, with a branch from Boirargues to Lattes Centre. Line 4 skirts the eastern and southern fringes of the city centre, running for 8.6km from Place Albert 1er to Saint-Denis.

The completion of these two lines takes the total length of the network to 54.4km.

Alstom has supplied 19 43m-long Citadis LRVs for Line 3 and 12 40m-long vehicles for Line 4.

Construction is expected to begin next year on the 17.5km Line 5, which will run north-south from Clapier in the north to Rond-Point Paul Fajon. The €330m project is due to be completed in 2017.