Road attributes – 4 Direction

Direction and lanes

The direction and lanes chapter will give you an overview of direction of travel (1-way/2-way) and number of lanes.

4.1 Direction of travel (1- or 2-way road)

The direction of travel attribute is one of the most important attributes for routing. Take great care when adding or changing direction of travel. Implement 1- or 2-way roads according to sign posted information in reality.

To edit direction of travel:

1) Activate the one way display to visualize the direction of travel.

Fig.: One way display

2) Click on the road

3) In the “Road attributes” panel, hover the cursor over the direction of travel options for a visualization on the map.

4) Click on the appropriate direction of travel option.

Fig.: One way coding

Note:

  • The direction of travel can only be updated for one road segment at a time. If multiple road segments are selected, the direction of travel menu will disappear.
  • Always check the consistency of the direction of travel attribute with the surrounding area. It is a common error to create illogical/conflicting direction of travel on adjacent roads.
Fig.: Illogical one way coding on a ramp system
Fig.: Illogical one way coding on a petrol station

4.2 Number of lanes

Number of lanes indicates the total number of traffic lanes in a single direction. The attribute provides the general lane trend. Do not consider parking lanes, turn lanes near intersections, etc. If a road is two way and there is a difference in the number of lanes in each direction, enter the higher value.

To edit number of lanes:

1) Count the lanes for the single direction by using satellite imagery or  based on your local knowledge.

2) Choose the appropriate lane category

Fig.: Lane category should be “1 lane” as indicated by the image (parking lanes are not counted)