HERE Map Content Developer's Guide

Lane

Message Summary

message Lane

A lane within a segment. Travel direction of the lane is provided by the segment anchor.

For example, consider a road segment with the following configuration of lanes: bi-directional auto access, a center turn lane in between them, bi-directional bicycle access on the right hand side of the road.

End Node

Type: || Regular | Center Turn | Regular | Bike | Bike || Travel Dir: || South | Both | North | South | North || Lane Number: || 1 | 2 | 3 | 4 | 5 ||

Start Node

This configurations result in three segment anchors: [1] Range 0.0 - 1.0, RelativeDirection: BOTH [2] Range 0.0 - 1.0, RelativeDirection: FORWARD [3] Range 0.0 - 1.0, RelativeDirection: BACKWARD

Lane 2 is published on segment anchor 1. Lane 3 and 5 are published on segment anchor 2. Lane 1 and 4 are published on segment anchor 3.

Attribution is then applied to the lanes as applicable. For example, LaneType=Regular references lanes 1 and 3.

Include: lane_attributes_partition.proto

Properties

Field Type Label Description
segment​_​anchor​_​index uint32 repeated

Index of the segment anchor to which this attribute applies. 0-based index references to segment_anchor in LanePartition. The RelativeDirection of the segment anchor indicates the travel direction for the lane. List is always length 1.

identifier string  

An identifier for the lane in the format of domain:system:type:id, for example, "here:cm:lane:3455277". This property is unique in a catalog.

lane​_​number uint32  

Relative position of this lane in the sequence of lanes across the segment range. The ordering is from left to right in the FORWARD RelativeDirection (from the segment's start node to end node). If there are N lanes for a segment range, there will be N Lanes with lane numbers 1 through N. The Lane with lane_number 1 is the leftmost, the Lane with lane_number N is the rightmost. This value N will match the physical lane count for this segment range published in the Navigation Attributes layer. There will be 1, 2, or 3 segment anchors for the collection of lanes across a single range, one for each unique direction of travel: Both, Forward, and Backward.