First, make sure the intersection and exit you are mapping meet the above guidelines.
Handle one direction of travel at a time.
For each direction of travel, lanes must be mapped on two segments: the "entrance segment" (immediately before the intermediate segment) and the "intermediate segment" itself.
In the entrance segment, state the total number of lanes entering the segment.
Any lane that can be used to turn left or go straight should be marked as a continuous straight lane.
Right turn lanes should be mapped normally.
In the intermediate segment, include the total number of lanes on the mid-segment (which should be equal to the number of lanes on the entrance segment minus the number of right-turn lanes).
| Input segment |  | ||||
| Intermediate segment
|  |
