BDP Freeway Failures

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Re: BDP Freeway Failures

Postby kentsmith9 » Mon May 14, 2018 4:10 pm

kjg53 wrote:Here's a rather short off/on route that was reported by one of our local area managers.

https://www.waze.com/en-US/editor/?env= ... st=8010430

I added the following note on the map to collect more data:
kentsmith9 on the map wrote:Strange. As far as I can see, all the criteria are set for Waze to prevent this ramp-to-ramp alternate route unless there was a huge shutdown on the freeway (which appeared not to be the case).

I have added two alternate road names to the two bracketed segments on the freeway as a test. Currently those two bracketed segments (where the ramps start and end on the freeway) have alternate city name which is not supposed to be considered. However, I'm wondering if something broke and it is looking at the city name change and getting a false road name change. As of the next map update from 5/14 am, this should not trigger if that was the problem. If it triggers again, we need to investigate further.
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Re: BDP Freeway Failures

Postby kjg53 » Wed May 02, 2018 11:11 pm

Here's a rather short off/on route that was reported by one of our local area managers.

https://www.waze.com/en-US/editor/?env= ... st=8010430
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Re: BDP Freeway Failures

Postby Nagamasa » Fri Apr 21, 2017 11:00 pm

dude463 wrote:This one uses all 4 leaves of a cloverleaf to continue straight on I-405. It's not needed at all. In heavy traffic it still wouldn't be more efficient.
https://www.waze.com/en-US/editor/?env= ... st=7333825
https://www.waze.com/en-US/editor/?env= ... st=7296618


FYI, these two look like they were on the virtual C-D lanes, to get back to the mainline. Wouldn't be a good example for the other failures we're seeing. (It's possibly a failure of the virtual C-D design, not failure of BDP.)
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Same with one with at Ellingson Rd.

This one that route to West Valley Hwy isn't necessarily a failure--it's rush hour traffic where you could save time detouring off the freeway: https://www.waze.com/en-US/editor/?env= ... st=7340504

(Just trying to make things easier for devs)

--
Otherwise, the remainder are generally valid concerns. :(

Let me add one from California to the mix: https://www.waze.com/editor/?env=usa&lo ... st=7330258
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Re: BDP Freeway Failures

Postby Nagamasa » Wed Apr 26, 2017 2:11 am

dude463 wrote:I'm not sure if any of that has anything to do with it. Detouring off the freeway and taking an alternate route is one thing, getting off just to get right back on is a good way to find some road rage.


I'm not disagreeing with road rage, and I completely agree that I-405 @ 30th as well as the one in Woodland are suspicious.

However, the one on SR-167 shows exiting from the HOV/HOT lane, ramp off HOT, physical off-ramp, across the street, on-ramp, to mainline SR-167. Or in algorithm terms Freeway1-Ramp1-Ramp2-Ramp3-Freeway2, which is not a penalized detour.

Actually for virtual C-D and HOT off-ramps, may I suggest we add the alt name of the freeway (SR-167 S for example) on the ramp segment between the express lanes and the actual off-ramp, so that the alt name of that virtual ramp matches with the mainline, thereby penalizing the off-ramp on-ramp correctly.
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Re: BDP Freeway Failures

Postby Nagamasa » Sat Apr 29, 2017 2:49 am

In the HOT HOV scenarios, BDP likely never triggered and will not trigger unless there is a (alt) name match.

Without names matching, all those looked like to the routing algorithm is that you took a couple ramps to a different freeway.
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Re: BDP Freeway Failures

Postby Nagamasa » Sun Apr 30, 2017 7:08 am

Yes the virtual C-D is working, and we've stopped it from weave directly on and off of the Express Lanes to the mainline.

However, the design as-is did not design for this case, exiting the Express Lanes and then back onto the mainline via off-ramps.
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Re: BDP Freeway Failures

Postby Nagamasa » Tue May 02, 2017 10:25 pm

Can you disconnect, save, and re-connect all segment involved in that interchange? One thing that is common to all the drives through that one freeway segment is that they are all in between 6:20-6:40.

If there's errant data, that confined 20 minute time block could be one the one causing issues.

I'm trying to push that we try and diagnose the issue, rather than hack the issue away. BDP is something we're supposed to know and be somewhat familiar with. This is very basic situation that BDP is known to account for.
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Re: BDP Freeway Failures

Postby Nagamasa » Wed May 03, 2017 12:02 am

All I'm asking is to reset the route timings. This is akin to a computer technician asking you to restart your computer before further diagnosing the issue.

Policy discussions should be directed to the US wiki subforum: https://www.waze.com/forum/viewtopic.ph ... 6&t=214805
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Re: BDP Freeway Failures

Postby Nagamasa » Wed May 03, 2017 7:59 am

At E Marginal Way and the two other ones in the middle of nowhere along I-5 ([1] and [2]), one common thing that tied all 3 of these together is that one of the freeway segments at one of the ends of the ramp did not have the same city as the other end.

BDP matching once included name /and/ city matching, but was changed to just name matching--however, I have seen coincidences where a city mis-match could have caused an issue: https://www.waze.com/forum/viewtopic.php?f=622&t=175051

In Waze, we generally allow the Waze algorithm to decide the best route. In cases of accidents or extreme traffic, taking the ramp may in fact save substantial time. Big detour penalty was designed with the intent that the user doesn't go out the way to save a miniscule amount of time, such as on these ramps during free-flow. Hence, we should be focusing on why a feature is not working here. The Wiki pages subforum should be used to discuss what and when (not) to use a feature.
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Re: BDP Freeway Failures

Postby Nagamasa » Thu May 11, 2017 8:17 pm

nidnarb wrote:Got another one this morning.

https://www.waze.com/en-US/editor/?env= ... st=7383607


Nagamasa wrote:At E Marginal Way and the two other ones in the middle of nowhere along I-5 ([1] and [2]), one common thing that tied all 3 of these together is that one of the freeway segments at one of the ends of the ramp did not have the same city as the other end.


Seems to fit that the criteria as well. Can you add "I-5 N, Seattle, Washington" as an altname here https://www.waze.com/editor/?env=usa&lo ... s=54537892?
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