Sections of the viaire frame of the Métropole de Lyon

Wired to the axis of the track. Any insurmountable obstacle generates another section. The sections are oriented in the direction of increasing numbering. Each section has as information: The direction of circulation in reference to the sense of numbering, the nature of the traffic, the domaniality, the importance It is related to the denomination of the way and the addresses. A section joins two nodes (usually a crossroads) and the whole generates a graph. The concepts of change of direction and number of lanes are not managed. A section attached to two different denominations is duplicated (municipal limit,...). Sections without denomination are not seized.