http://www.waze.com/wiki/index.php/Best ... g_practice"
Overall GoalsUsability
When it comes to the map, the first & foremost goal of editing is to provide the driver with a map that is easy to follow on a small display, and to produce sensible verbal instructions when (and only when) they are needed.
SimplicityIt 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.
RetentionAs a result of people driving over them, road segments retain certain information (e.g., average speed) that is used in route optimization. When a segment is deleted, that information is discarded. Given a choice between deleting a tangle of segments and creating new ones in their place, vs. untangling them and reusing them, it is often better to 'recycle'. "
"When (Not) to Split a Two-Way RoadIt is not always a good idea to split anything short of a freeway or major highway--which use nothing but ramps to enter/exit--into two one-way roads. 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 i
nterrupted by a cross segment at every intersection.
There is a center turn lane, even a wide one, between directions of travel, does not count because it is drivable.
-Google Maps or other mapping source show it as a split road. "
Detta är ju rätt tydligt om nåt.
Om man skall översätta till talspråk så står det:
Gör det inte onödigt komplicerat om det inte behövs för att det skall funka på rätt sätt i klienten. Dvs, Splitta inte vägen bara för att det ser ut så i verkligheten eller på kartan.
Att splitta vägar med korsningar (typ motortrafikleder med rödljus) borde vara uttryckligen förbjudet och jag fattar inte varför dom har en rekommendation att splitta vägar som har mellanrumm mellan GPS-spåren på ett visst zoomläge för vissa tenderar att BARA läsa den delen och vägrar läsa de flera andra reglerna som talar emot att splitta.