User:Johnsninja58/BestContinuation

Waze does not give you instructions every time you drive through an intersection if it thinks you are continuing "straight" down the road, or if it thinks you don't have a choice about which way to go at the intersection. If your way out of the intersection is the Best Continuation (BC) of the way you came in, Waze gives you no instruction.

To determine if your route out is the best continuation, Waze checks the number of possible ways out and their turn angles, road names, and road types.

1. If there is only one way to continue through the intersection from the segment you came in on, the outgoing segment is the best continuation, no matter the turn angle, road type, or road name. https://www.waze.com/editor/?env=usa&lon=-75.09003&lat=39.98620&layers=2853&zoom=7. Bath to east Victoria
2. if the turn angle to the outgoing segment is sharper than 45 degrees AND there is at least one other way out, then the outgoing segment is NOT best continuation.
3. If neither of the above is true, and the turn angle of the outgoing segment is less sharp than 45 degrees, then it is the best continuation unless there is another possible outgoing segment with a turn angle of 45 degrees or less that I matches the incoming segment as well as or better than the incoming segment
   1. if there is an eligible segment that matches both name and type of the incoming segment, but the outgoing segment does not match both, the outgoing segment is NOT the best continuation.
   2. otherwise if ...
   3. otherwise if ...
   4. otherwise, it is the best continuation .

As you know if there is only one exit segment less than 45 degrees from the entering segment waze will not provide an instruction. However if there are more than one exit segment and waze has determined there is a Best Continuation (BC) waze will only provide instructions for the other segment(s).

The rules for Best Continuation are rather simple, however in practice it can easily become confusing for even a senior editor.

The basic rules are you must have two or more exit segments that are less than 45 degrees from the entering segment, Waze will then look for a matching road segment trying to match Street Name and Road Type in this order

If neither of the above is true, and the turn angle of the outgoing segment is less sharp than 45 degrees, then it is the best continuation unless there is another possible outgoing segment with a turn angle of 45!degrees or less that I matches the incoming segment as well as or better than the segment you came in on

and there are other possible ways out of the intersection 

1 - Street Name and Road Type (names can be a cross match from alt name)
2 - Street Name
3 - Road Type

You can not have two Best Continuation, so if there are two equally good matches, there will not be a BC. All other turn instructions will be based off of the angle and Road Type of the exit segment, within a RHT country the options are: stay left (only one), exit right (only one), and stay right (you can have multiple).


Examples of Best Continuation in Action Add SV image, WME image and explanation of
-BC Name and Type
-BC Name
-BC Type
-BC confusing Name and Type examples

Example Intersection	Description	How Waze Acts	Real Life Example	Permalink
	In this example, to the Left, you can see how we have a road type of a Major Highway and Name match before and after the intersection. The simplest example of Best Continuation in action. To the Right you can see how Waze treats this intersection. The white circle indicates that "No Directional" prompts will be given along that road			Permalink Here is an example of a Best Continuation in action with the Major Highway Watertown St continuing on. No instructions will be given in this example as you travel east to west.
	Example			Permalink
	See here how		File:BC type example.png	Example