Rond-point

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Roundabout/fr

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Rond-Point

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Les ronds-point sont des segments particuliers pour la navigation dans l’algorithme de calcul. Quand un conducteur approche un rond-point, un icone spécifique apparaît dans les icônes de direction avec le numéro de sortie qui s'affiche.

Si vous voulez cartographier un rond-point, il faut d'abord représenter un carrefour normal avant de sélectionner l'outil "rond-point" dans WME qui connectera les différentes rues automatiquement au rond-point.
Vous trouverez plus d'information sur le wiki: Roundabouts/USA (en anglais).

Remarques

  • Encoder un nom de ville mais pas de nom de rue pour obtenir une bonne assistance vocale lors du guidage.
  • Le rond-point doit être constitué du type de segments le plus élevé qui est raccordé à celui-ci.
  • La vitesse à encoder sur le rond point doit être équivalente à la vitesse la plus haute des segments raccordés.
  • Les segments constituants le rond-point sont verrouillés au niveau requis suivant le type de route.
  • Un cul de sac ne doit jamais etre constitué d'un rond-point.
  • Si le panneau typique pour définir un rond-point (D5) n'est pas présent il faut représenter un carrefour normal (circulaire si nécessaire).
  • Pour déplacer completement un rond-point, vous pouvez utiliser le script: WME RA.


Cul de sac should be defrined as a dead end street, not as a roundabout
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Only traffic circles with the D5 traffic sign should be mapped as roundabout. Other traffic circles should be mapped with separate curved segments or just as crossing.

How to create a roundabout

  1. Draw single road segments that will lead to the roundabout and ensure they extend into the center of the roundabout area. Use the visual map or gps points to align the roads.
  2. Hover the mouse over the DrawRoad.PNG button, on the toolbar at the top of the page. Choose "Roundabout" (Shortcut key: o).
  3. Click the mouse on the map at the center of the roundabout area.
  4. Move the mouse cursor outside, up to the middle of where the roundabout road should be, and single-click. WME now creates the roundabout and will remove all segments within it.
    For an oval shape, hold Shift while moving the cursor outside.
  5. Roundabouts should not get a Street name to enable proper routing. Enter the City name in the "Edit" menu left. Check the "None" box for the Street name.

Normal vs complex roundabouts

Waze supports two different styles of roundabout navigation instructions. One style instructs simply to turn or continue at the roundabout, while the other instructs how many exits one must pass before leaving the roundabout. The US editing community terms these two instruction styles as "normal" and "non-normal" respectively. The term "normal" is used here in its mathematical sense to mean "orthogonal", "perpendicular", or "at right angles".

This section will explain the difference between a normal and a non-normal roundabout. Normal roundabouts:

Require all of the following

  • 2-4 nodes.
  • All exit nodes aligned within "normal" range of the entry node
  • A diameter less than 50 meters

Provide the following instructions:

  • "At the roundabout turn right"
  • "At the roundabout continue straight"
  • "At the roundabout turn left"
  • "At the roundabout make a U-turn"

When NOT to use a Roundabout

Roundabouts in WME will yield specific routing instructions to drivers, such as "at the roundabout, take the third exit". If those routing instructions could confuse drivers, the Roundabout tool should not be used.

Roundabouts should never be used for cul-de-sacs or other dead end streets, regardless of how round they are. A single road segment leading to a cul-de-sac should be drawn as a dead end. With very large roads it might be advisable to create a loop, but not a roundabout.

Remarks

  • The road type of the roundabout is always the same as the highest road type connected.
  • Enter as Speed limit the highest maximum speed of the connected segments.
  • A dead-end street (cul-de-sac) should not have a roundabout at the end (see above).
  • If there is no road sign for a roundabout, don't use a roundabout.
  • In some cases, a roundabout is not used even if there is a roundabout sign, to create the best possible instructions for the situation.
  • Don't connect more than one segment on to 1 junction of the roundabout, nor make connections within the roundabout. This lead to weird instructions, like "take exit zero", or no instructions at all.

Tools

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For moving and resizing a complete roundabout without losing traffic data, the Roundabout Utility Script (WME RA util) can be used.




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