Detour detection mechanism in the wiki

[CBenson]

In response to the routing discussed here waze has confirmed that the big detour prevention mechanism is merely a high penalty that may not be effective to prevent routing when the traffic on the highway is very slow. I thus propose to change

Waze routing will not present routes over a detour off a highway/freeway and back on that same highway/freeway when all of the following conditions are met:

to read

Waze routing will heavily penalize routes over a detour off a highway/freeway and back on that same highway/freeway when all of the following conditions are met:

We could also add a note that the detour prevention mechanism may not be effective in extremely slow traffic.

[CBenson]

The proposals look good to me.

[kentsmith9]

Waze routing will not present routes over a detour off a highway/freeway and back on that same highway/freeway when each of the following conditions are met:

1. the last segment on the highway/freeway before the detour has the same street name and same city name as the next highway/freeway segment after the detour (the segments are considered to have the same name if either the primary name or alternate names are the same, unnamed segments are not considered as having the same name),
2. the detour is more than one segment long, and
3. the detour is under the threshold length as defined below.

To be more clear I think it should say:

Waze routing will not present routes over a detour off a highway/freeway and back on that same highway/freeway when all of the following conditions are met:
...

[kentsmith9]

Seems to me that it would be appropriate to note this on the detours page in a "Notes" or "Side-effects" section. I've added this to the detour page, but consider it a draft that can be freely edited. Is there any reason not to put this on the detour page?

I like it.

Clarification question:

Thus in the intersection below, the configuration on the left will be used to route a U-turn, but the configuration on the right will not.

I propose (if accurate):

Thus in the intersection below, the configuration on the left will be used to route a U-turn because it uses a single segment between the two parallel roadways with the same name. In contrast, the configuration on the right will not use the U-Turn road because it branches from another segment causing multiple segments between the two parallel roads with the same name.

[sketch]

That looks good to me.

[CBenson]

Seems to me that it would be appropriate to note this on the detours page in a "Notes" or "Side-effects" section. I've added this to the detour page, but consider it a draft that can be freely edited. Is there any reason not to put this on the detour page?

[sketch]

I've noticed that the detour mechanism affects a particular construction that's used in a few places around here. I'm not sure where this would best go in the Wiki, or if this configuration is used elsewhere, but I do think it should be here to guide editors.

Any time a U turn segment splits off from a left turn lane, U turns are prohibited by detour prevention — because 2 segments are required to make the U turn, it's treated as a detour.

This configuration does not work:
[ img ]

The configuration on the left works, the configuration on the right does not:
[ img ]

This configuration works:
[ img ]

[kentsmith9]

Hmm, maybe just say detour prevention mechanism. Then have sections for both "big" detours and "small" detours. Can we say the following at this point?

Waze plans to implement a small detour prevention mechanism to deal with instances where waze calculates that that its a few seconds faster to to continue straight or make a right at an intersection a make a u-turn rather than just turning left. Waze will eliminate such detours if there is under a 30 sec difference in the routes.

It sounds good if we have any indication they will actually be getting to this as some point.

[CBenson]

Hmm, maybe just say detour prevention mechanism. Then have sections for both "big" detours and "small" detours. Can we say the following at this point?

Waze plans to implement a small detour prevention mechanism to deal with instances where waze calculates that that its a few seconds faster to to continue straight or make a right at an intersection a make a u-turn rather than just turning left. Waze will eliminate such detours if there is under a 30 sec difference in the routes.

[AlanOfTheBerg]

Any input on what we should call it at this point?

Does Waze's official "name" make enough sense to the genpop?