Alternate Names and Detour Prevention

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Alternate Names and Detour Prevention

Postby CBenson » Thu Oct 02, 2014 2:15 pm

I have submitted a few examples of routes that waze prefers that are longer and slower than alternate routes recently to be reviewed by waze staff where the answer has been that that alternate names have triggered the big detour prevention mechanism.

One example is discussed here. The problem is that US-17 is concurrent with I-66 between a couple of exits. Thus US-17 exits/enters I-66 to/from Winchester road here. As US-17 is an alternate name on both I-66 and Winchester Rd, waze avoids the ramps of the interchange if the route stays on US-17 and instead routes through the next interchange where the detour off/on US-17 is over 5 kms.

I'm not sure how to address this issue of avoiding interchanges where a secondary route triggers the big detour prevention mechanism.

Anyone have any methods for dealing with this circumstance?
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Re: Alternate Names and Detour Prevention

Postby Poncewattle » Thu Oct 02, 2014 2:40 pm

Could US-17 be placed as an alt-name on the connecting ramps as a work around?
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Re: Alternate Names and Detour Prevention

Postby CBenson » Thu Oct 02, 2014 3:06 pm

I don't believe so. I think waze is only looking at the names of the freeway/highway segments. But absent any better suggestions we could certainly try it and see what happens.
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Re: Alternate Names and Detour Prevention

Postby Poncewattle » Thu Oct 02, 2014 3:20 pm

Done.

And now we wait... :-)

I also put it on the short left turn ramp segment because the bit of US-17 it is turning on is triggering the same effect, as evidenced by this route....

https://www.waze.com/livemap?lon=-77.84 ... =-77.84191
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Re: Alternate Names and Detour Prevention

Postby AlanOfTheBerg » Thu Oct 02, 2014 4:59 pm

I've had to resort to removing alternate names on Wayfinder segments, but that's mostly just to get wayfinders to announce due to this poorly thought-out change to detour prevention.
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Re: Alternate Names and Detour Prevention

Postby CBenson » Thu Oct 02, 2014 5:20 pm

I'm not sure that this is a change to the detour prevention. They told us back in January that alternate names would be taken into account for the detour prevention. We will need to consider how any changes that we make to get the routing to work will effect the "keep" and "exit" instructions due to the recent changes regarding how alternate names effect when instruction are given.
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Re: Alternate Names and Detour Prevention

Postby Poncewattle » Thu Oct 02, 2014 5:26 pm

I'm driving down I-66 tomorrow, so assuming there's a tile update tonight and assuming this cheesy hack works on the routing, I'll test the TTS prompts by setting a route to Warrenton.
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Re: Alternate Names and Detour Prevention

Postby AlanOfTheBerg » Thu Oct 02, 2014 6:13 pm

CBenson wrote:I'm not sure that this is a change to the detour prevention. They told us back in January that alternate names would be taken into account for the detour prevention. We will need to consider how any changes that we make to get the routing to work will effect the "keep" and "exit" instructions due to the recent changes regarding how alternate names effect when instruction are given.

We did know that, yes. They just implemented it (actually fixed a bug) recently which put it into Place. However, the side effect was they also apparently use the same code to determine best continuation. So if an alt name carries to one branch of a freeway that used to give a "stay to the right" command, that instruction is no longer given. We have to remove the alt name to get the instruction. I don't see why the navigation instruction could not be determined independently from detour prevention.
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Re: Alternate Names and Detour Prevention

Postby CBenson » Thu Oct 02, 2014 6:58 pm

Ahh! Well I guess that would explain why all these detours causes by alternate names have recently come to light.

Do we have a solution for getting waze to route through an exit where a numbered route also passes through that exit and is identified in the alternate name fields?
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Re: Alternate Names and Detour Prevention

Postby bgodette » Thu Oct 02, 2014 9:07 pm

US-17 shouldn't be on the freeway segments crossing Winchester. Additionally Winchester should likely not have that intermediate node and type change between the ramps. US-17 enters and leaves the concurrency with I-66 using the ramps, the BUS route begins/ends at the north ramps.
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