From Wazeopedia

Junction Style Guide

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Loops: Copied from
However, if the cul-de-sac has a very large bulb with a large island in the middle, it may better be treated as a [[#Loops|Loop]]. A good rule of thumb is if you were standing at the end of the cul-de-sac, can you tell that it is just a cul-de-sac? Or does it look like two different roads? If you see an island, but are not sure if it is significant, leave the Loop out. If "Missing Road" errors occur on the road, then add a Loop.
==== Loops ===<gallery mode=packed-hover>File:U-shaped Road.jpg|U-shaped roadFile:Jct loop bulb.png|terminal or dead-end loop</gallery>Road segments form a loop when you can trace a path from a starting point around to the same point without retracing any portion of the traced path.
Loops are roads ==== Every loop must be made up of three or more segments ====[[File:Loop_3-part_6.jpg|right]]Any loop that does not follow this rule can cause problems for the Waze routing server. If there is no side-street, you can entermust [[Map Editing Quick-start Guide#Splitting a segment|insert an extra junction node]] along the loop. Many new editors will see the extra junction node(s), assume they are not needed, and without reversing course, end up at delete them. One way to prevent this is to add a driveway to the same place you startedloop. Another solution is to educate new editors.
===== Loop rules =Two-segment loops====# A road Two-segment must not start and end on the loops create a situation called "same junction node (loop back onto itself)# Two endpoint drivable segments must not share the " or "same connection segments". There are two end junctions# Any loop must be made up of three or more ways to get from one junction node to another without going through any other nodes. They can cause a a problem for the Waze app because the routing server gives your mobile app a list of node ids, but the app needs to tell you which segmentsto drive on. If there are two ways to get from one node to the next without going through any other nodes, then the Waze app might just have to guess. It might guess a detour off the highway through a gas station or scenic overlook. Please save Waze from this silliness. Correct two-segment loops.
If these rules ====One-segment loops====[[File:Dead end loop.png|thumb|right]] One-segment or self-connected loops are not followed, the routing server will have difficulty often found in providing routes into and out of basemap areas. It is difficult for Waze editors to create one-segment loops. Depending on the loop. Any loop broken into situation, these should be converted to three -segment loops or simple dead-end roads. For more on loops on dead-end roads, please see [[Cul-de-sac#Cul-de-sacs|cul-de-sac]]. It is important to preserve house number data on these segments by .===== Fixing one-segment loops=====If you try to edit a junction will not have this loop, but then cannot save the changes, undo your changes and then try one of the following to fix it:
If there are no natural interruptions (side-streets or driveways) to the loop and the entire loop is represented by one road segment that connects with itself, you must [[Map Editing Quick-start Guide#Splitting a segment|insert superfluous junction nodes]] along the loop segment. The specific location does not matter, but most people put it near the half-way point of the segment. {| class="Wikitable floatright"| [[File:Loop_3-part_1.png|x180px|border]]| [[File:Loop_3-part_2.png|x180px|border]]|}Here is an example loop showing the proper three segment configuration. Note that when selecting the two adjacent segments the bridge icon appears tempting an editor to link the two segments. That would be counter productive to the routing server though. The only work around is to either lock the segments at a higher level or find a driveway to add to the map on this road causing the bridge icon not to appear at that point.{{clear}} [[File:Loop_3-part_3.jpg|left]] This is an example of an improper 2-segment loop. The routing server will have a difficult time properly routing traffic to or from either of these segments. As indicated above, add a junction point along either segment to create three segments in this loop.{{clear}} [[File:Loop_3-part_6.jpg|right]] This is a side-by-side example of a proper 3-segment loop and improper 2-segment loop in a parking lot. The 2-segment loop can be fixed by adding a junction node along either segment.{{clear}} '''NOTE:''' It is very easy for an editor to see an extra junction node along a segment, assume it is superfluous, and delete it, when in fact it is necessary and should remain in place! This problem is magnified if the loop road is large or shaped so it is not obvious that it is a loop. One solution is to identify a path or driveway branching from the loop road and add it to the map, forcing a 3-way junction that would be less likely to be deleted. ===== Loop save errors =====The Waze Map Editor may be resistant in editing a loop that does not already follow the rule that it must be broken in two. If you run into saving errors, try one of the following approaches. *If the loop and the road leading to it have the '''same''' name: *#Select the loop and the road.*#Click the bridge icon that appears (one end of the loop will disconnect from the other)*#Move the now free end of the loop so it is slightly separated*#Save#Cut the loop#Reconnect the disconnected end of the loop#Confirm turns *If the loop and the road leading to it have '''different''' names: *#Draw a new road segment that connect connects to the loop/road junction*#Give that new road the same exact name as the loop*#Select the loop and the new road segment*#Click the bridge icon that appears (one end of the loop will disconnect from the other)*#Move the now free end of the loop so it is slightly separated*#Save#Cut the *Create a dead end road or a three-segment dead-end loopas appropriate.#Reconnect the disconnected end of the loop*Fix elevations.#*Confirm turns.
Here is a [ video on YouTube showing the second method].
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