Both the Road Centerline Model and Lane Model represent the same real world road network. The following figures show how the same road segments are represented as segments and nodes (the Road Centerline Model), and as Lane Groups and Lane Group Connectors (the Lane Model):
The two models are logically "glued"together in both directions. Each Lane Group Connector (Lane Model) has a position on a segment in the Road Centerline Model. Every portion of a Lane Group is associated with a segment in the Road Centerline Model.
Lane Group References on Road Centerline Model Segments
The following figures illustrate how each Lane Group Connector is associated to a parametric position, as in the length fraction from 0 to 1, along a segment:
Road Centerline Model on Lane Group Reference Geometry
Similarly, the Road Centerline Model is mapped onto Lane Group Reference Geometry.
Lane Groups may fit within one segment, or span multiple segments. A road segment is assigned to a Lane Group via anchors. The entire Lane Group must have some road segment associated for all of its length, with no gaps or overlaps.
The following example is the same topology as above, but the road segment anchors are colored for clarity:
The road segments are projected onto the Lane Groups to determine the associations: