Template of topic 380525, post 1
In November 2021, Waze released the road width feature. Road width provides the falcon snapper with more precise data, allowing it more accurately track the path of a vehicle especially at junctions where the same originating segment splits such as forks in the road or the typical exit ramp on motorways. Editors can set road width where required.
In simple terms: we need road width in cases of ambiguity, Basically helping Falcon decide where the vehicle is and increasing the likelihood of Falcon making the right choice.
Permissions
Please refer to country specific permissions.
Edit permissions are also limited to the lock level of the segment and in most cases the outgoing segment(s) lock level. However, all editors can view the road width settings.
When should road width be configured?
Road width should only be set on the number of lanes at the beginning of the roads that originate from the same segment (connectivity driven snapping). The following scenarios help understand this further:
- Forking points e.g. motorway exits or at grade connection slip lanes…
- Parallel roads e.g. service roads or ramps after motorway exits or minor or major highways. In the instance of parallel roads, road width should be mapped on all segments for as long as they are close to each other.
Road width is used by the Falcon snapper at the beginning of segments that originate from the same segment . The number of lanes added does not affect the entire segment. For example, adding a road width of 2 where there is only 2 lanes for a short distance and the rest of the segment is only 1 lane, will not have any negative affect.
Note: Segments should not be purposely split if the number of lanes change.
How to access road width in WME?
The road width interface can be accessed by selecting a segment, and in the edit panel, select the “lanes & road width” tab, then select set road width. After setting the number of lanes for road width, ensure to select “Apply”.
Adding road width to a segment
Guidance on road width
Number of lanes
Add the number of lanes at the start of the segment.
Lane width
Unless the lane width is significantly different to the default width for that road type, use the default lane width and do not edit or delete the information in this field. Otherwise, add the width of one lane in metres.
Note: Drivers reporting that Waze is slow to detect a change of route at a fork may be an indication that the road width setting is inaccurate and needs to be reviewed. In this situation, use the ruler tool on the bottom right in WME to measure the width. 
Examples
Forking points
The motorway has an exit towards the left.
- a) The exit ramp is two lanes wide. The segment width is set to two lanes.
- b) The continuing motorway segment is four lanes wide. The segment width is set to four lanes.
Example: Set road width at a forking point on the continuing segment and exit ramp
The road continues west with an at grade connection slip lane mapped at this intersection.
- a) The at grade connection slip lane is two lanes wide. The road width is set to two lanes.
- b) The continuing primary street segment is three lanes wide. The road width is set to three lanes (even though there is a dedicated right turn lane).
Example: Set road width at a forking point on the continuing segment and at grade connection slip lane
Parallel roads
Below is a classic example of service road forking from a minor highway and remaining parallel to it. How would we treat this? See below.
Road width determination at a fork from the same originating segment where both roads maintain a close parallel trajectory to each.
The originating segment that segment A and B connect to is 2 lanes wide - it does not require lane width.
- a) The continuing minor highway segment is two lanes wide. The road width is set to two lanes.
- b) The service road entry street segment is one lane wide. The road width is set to one lane.
- c) To ensure Falcon does not recalculate and set the vehicle back to the minor highway, set the service road street segment to one lane.
Or said another way, after the fork Falcon would need to understand if the driver really took the off-ramp/service road or not, without road width we use the default values and they are not always accurate, this means that if the GPS was slightly off by a few meters there is a chance that Falcon might snap the driver to the wrong segment.