![]() Pay attention to their correct orientation. If a road is split into two separated carriageways (one approaching, one departing), draw those explicitly and tag these carriageways with oneway= yes.This way, routers can safely recognise that a section of the roundabout has to be driven through. A segment of the roundabout is required between these roads. Do not directly connect approaching with departing roads.Connect the approaching roads/ways with the roundabout.If there exist a postal addresses for residents located inside or around the roundabout which is different from the connecting highways, then this is usually the name of the roundabout.However, large roundabouts may have a dedicated name. In many cases, the roundabout remains unnamed as it is undecidable between the competing connecting highways.Generally, the name of the roundabout is different from the name of highways connecting or passing though them. Give it a name only if is official or displayed.It may be useful to tag the number of lanes=* in the ring (typically 2, where long vehicles will need to use both 1-lane roundabouts are especially important to tag if they exist for large, but usually roundabouts the second lane, or are transformed to miniroundabouts whose central island is not blocking but can be used at very slow speed by long vehicles).It is not wrong to add it explicitly, though. Tag the OSM way(s) of the roundabout with junction= roundabout.Con: If adjacent entries/exits are close to each other, it will become tricky to leave a the required segment between them (see below). Mapping the middle of the road: Pro: Less distortions, the mapped shape better reflects reality.Con: Entries/exits may become distorted if they have >1 lane. Pro: Makes it easier to leave a segment between adjacent entries and exits. If in doubt, it makes sense to check for nearby similar roundabouts that have already been mapped and adopt their style. Where exactly: Either on the middle of the outermost lane or on the middle of all lanes.Direction: The way(s) must be drawn in the direction of traffic flow.Shape: Most editors have a tool to create a circle.Short tutorial showing how to draw a roundabout using the iD editor (click on image to start animation). The size of a roundabout can vary from small to very large with several lanes. The tag junction= circular should be used on rotaries. Where traffic does not have right of way, this is a rotary (also called traffic circle). However there exists exceptions in some roundabouts in some cases where there's a special service way passing through the island, reserved to buses/tramways/emergency vehicles (which will have priority to the normal traffic, and for which there may be traffic signs requiring vehicles on the ring to give the way in normal times these giveways and traffic signals are off). That is, the roundabout itself should be free from all intersection controls including traffic signals, stop signs or stop markings, give-way (or yield) signs or give-way markings. The tag junction= roundabout is used only on road intersections where traffic on the roundabout has right of way. A roundabout is a generally circular (self-intersecting) road junction where the traffic on the roundabout has always right of way.
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