user sub-service which supports the dynamic presentation of warning information to drivers and may be generated in response to roadway weather conditions, road surface conditions, traffic conditions, obstacles or animals in the roadway, and any other transient events that can be sense, or that recognise the limitations of a given vehicle for the geometry of the roadway, (e.g. rollover risk for tall vehicles)

command and control system in which the wayside control interfaces with the vehicles or trains only at specific points

These are applied where the presence of pedestrians or pedestrians with a special characteristic (e.g., school children) may share a road space in a largely unsupervised manner. Treatments include pedestrian warning signs, shared zones, school zones, local area traffic management schemes, and lighting.