en:c-its:messages:mapem
MAPEM (MAP Extended Message)
MAPEMs describe the topology of an intersection (ETSI TS 103 301): the geometry of its lanes, which ingress and egress lanes exist, and which maneuvers connect them.
A MAPEM contains, among other things:
- the reference position of the intersection
- lane geometries (as offset points)
- lane attributes (vehicle lane, bike lane, crosswalk, …)
- the allowed connections between lanes, referenced by signal groups
MAPEMs are sent by C-ITS traffic lights (RSUs). On their own they are mostly static — the dynamic signal states are transmitted separately via SPATEM; both together enable use cases such as GLOSA (Green Light Optimal Speed Advisory).
en/c-its/messages/mapem.txt · Last modified: by fasteiner