Direct lines are set in order to make some courses faster, skipping several stops.
The line TBNight functions from 1:30 am to 5:50 am, in order to substitute the whole network between campus, Victoire place and other nightclub districts on Thursdays, Fridays and Saturdays night.
Flex' lines have a route fix which leads in a geographical area.
There exists 4-day flex' lines, which have a regular frequency, and 7-evening ones which have only 2 departures at 2:00 am and 4:00 am from Quinconces station.
[1] When there are events at Arkéa Arena or at Matmut Atlantique, shuttles are set up by TBM.