It is not a goal to model the physical roadway lane-by-lane. Doing so often leads to unnecessary complexity--which means a cluttered map, confusing verbal directions, and lots and lots (and lots!) of extra map maintenance.
A road should not be split when:
- There is a curb or non-drivable median less than 5m wide between lanes of travel (see exceptions above).
- The non-drivable median is interrupted by a cross segment at most intersections.
- There is a center turn lane (any width) between directions of travel. Splitting this type of road created problems when people turn from the middle lane because there is no road for the navigation to follow.
- (Just because) Google Maps or other mapping source show it as a split road.
When initially reviewing whether to split or "un-split" (merge back together) a roadway, consider these points first:
If a road is currently working with no problem reports, consider leaving it as is.
After reviewing the criteria for when to split or not split a road, if you cannot be sure which way to go, consider sending a permalink of the road to the map editing forums to get additional feedback from other editors.
Try to avoid switching roads back and forth between being split and "un-split". For example, if most of the road is clearly split and only parts would be considered a single two-way road, consider leaving it all split. The same goes for the opposite situation.
And I think if we must change certain areas, then we should work together to ensure that its done properly so we don't end up with unfinished work resulting in hundreds of problem reports
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