why no left turn at intersection

Moderators: Unholy, bextein

Re: why no left turn at intersection

Postby bz2012 » Thu Jan 16, 2014 5:32 pm

And this one could also be a jolly driver post
Image
WAZE wouldn't let him turn left despite the fact that the turns were enabled. I think he meant 'no J turn needed!' because Louisiana has been putting J turns in many places.
http://www.dotd.la.gov/administration/public_info/projects/j-turn/home.aspx

WAZE seems to have implement its own version of the 'J' turn.

I call it the 'Y' turns because it makes the drivers wonder 'Y'! :)
State Manager, Louisiana
bz2012
Map Raider
Map Raider
 
Posts: 1410
Joined: Wed Nov 23, 2011 4:32 pm
Location: Baton Rouge, La
Has thanked: 924 times
Been thanked: 256 times

Re: why no left turn at intersection

Postby aplycon » Tue Jan 21, 2014 1:31 am

I have examples of this popping up in south Florida as well. I'm glad I found this thread to see how frequent this issue has been occurring. Hoping that CBenson's latest post from Waze staff will prove to rectify this routing issue. Waze should almost always chose the left turn. I think that the driver should make their own decision approaching a light to wait for a long-queued left or a right on red + U turn based on the traffic and their driving style. I drive more aggressively and may chose that right on red "shortcut" but most people I know (and when are my passengers) denounce that practice as impatient and risky.

UR from Jan 1 in Coconut Creek, FL:
Image
That right turn + U turn adds nearly 1km to the route instead of just taking the left. How could that possibly be time-saving?
-AP

Paramedic|Denver, CO
Nexus 6P, Android 6.0.1, Waze 3.9.8.0[/size]
aplycon
 
Posts: 59
Joined: Thu Oct 03, 2013 1:01 am
Location: Denver, CO
Has thanked: 33 times
Been thanked: 5 times

Re: why no left turn at intersection

Postby slandrum » Tue Jan 21, 2014 9:13 pm

Daily I come across several more examples where instead of left turn, it wants to go straight through and U-turn back, or do a right, then a U-turn. And fairly common now popping up are instances where instead of going straight, Waze directs to take a right turn, then U-turn, then right again. This type of routing glitch seems to be getting more and more frequent with time. It suggests that either there's a serious problem with the routing engine, or there's a fundamental problem with the current concept of how Waze gets and uses speed information to make its decisions. When traffic gets heavy at an intersection, infrequently chosen alternates are going to start looking more and more appealing to Waze, and because no-one in their right mind would take them, Waze is never going to get a lot of data to refute it's ideas. Waze's problem is that it has no eyes, and can't see what's happening. It's information is indirect and incomplete. It can tell to a limited extent what the drivers do, but cannot tell any information about what they don't do, and has no concept why not. Waze doesn't even really respond when Wazers refuse its instructions, eventually it may raise a flag for someone else to look at, but that's very far removed and indirect, and is not at all responsive to the current situation.

Waze also has a lot of trouble getting good timing data for turns on divided roads. If you are directed to make a left turn at the intersection, you aren't going to turn left at the end of the segment leading up to the intersection, you are going to turn left in the segment in the middle of the intersection. That segment will almost always have good time, because you don't enter the intersection unless you are going to clear it (if you are obeying the law in the US). The backup you have waiting for the light, however, will get lumped in with the straight through traffic, polluting their data making Waze think it's slower to go straight, and the straight through data will pollute the left turn data making Waze think it'll be faster to turn left than it will. This timing data is improved if the intersections are changed to bowties, but that introduces other problems.
Orange County, CA, USA, Samsung Galaxy S3, Android 4.3 Image
slandrum
 
Posts: 362
Joined: Sat Oct 05, 2013 2:01 pm
Has thanked: 20 times
Been thanked: 85 times

Re: why no left turn at intersection

Postby CBenson » Mon Jan 27, 2014 4:15 pm

Here is what appears to be another example.
Regional Coordinator: Mid-Atlantic, US
Verizon, Nexus 6, Android 6.0.1, Waze 4.7.0.1
CBenson
Waze Global Champs
Waze Global Champs
 
Posts: 10259
Joined: Wed Nov 03, 2010 9:13 pm
Location: Crownsville, MD, US
Has thanked: 1051 times
Been thanked: 2326 times

Re: why no left turn at intersection

Postby rgatland » Mon Jan 27, 2014 5:47 pm

At the risk of dog-piling on this problem, I have seen several reports that fit this model, and in fact, I have had Waze try to give me some strange routing around a particular intersection several times. Have we heard back from the Wave developers regarding a resolution? If this goes on too long, Wavers could get disenchanted and opt for another alternative to Waze.
Image
rgatland
 
Posts: 83
Joined: Wed Jan 01, 2014 2:01 pm
Location: Piedmont Triad NC
Has thanked: 29 times
Been thanked: 10 times

Re: why no left turn at intersection

Postby Machete808 » Tue Jan 28, 2014 1:16 am

Agree that some adjustment to the algorithm is needed. We've been getting the same complaints about being directed the long way around, frequently to avoid a left turn.

Problem is, sometimes Waze is right, but sometimes the difference would be so minor that it's not worth the headache of doing all the extra turns, etc. Glad to hear they're contemplating some threshold, like a 30-second difference, before routing people people in some odd way.
Aloha,
Vicki
Hawaii State Manager
Area manager, Los Angeles
Country manager, Thailand
Image Image
Need support?
support.google.com/waze > Popular topics > FAQs > Other > Open a ticket
Welcome, new editors:
Here's a good place to start!
Machete808
Waze Mentor
Waze Mentor
 
Posts: 1255
Joined: Mon May 28, 2012 12:36 am
Location: Kaneohe, HI
Has thanked: 176 times
Been thanked: 193 times

Re: why no left turn at intersection

Postby SlowlySlowly » Tue Jan 28, 2014 2:42 pm

I recently returned to Waze after a few years. This scenario has arisen twice within my first two hours of driving. Both times instead of straight I was directed to make a right, a U-turn and another right. I spent quite a bit of time looking at the intersections in the editor before finding this thread.

If it happened to me twice in two hours of driving I imagine it has to be a very frequent occurrence. Probably not the best way to greet brand new wazers.

Of course a lot of people in my area drive this way, cut through parking lots and do other things that are considered bad form in the name of saving 30 seconds. Regardless of whether this is the fastest way to get through the intersection, should a navigation program be suggesting this route? Perhaps an aggressive driving mode is called for?
Stephen Cerruti (scerruti)
<Former> Area Manager for Coastal North San Diego
Oceanside, Vista, Carlsbad
Equipment: Galaxy Nexus, Chrysler Town & Country
Will code for food.
SlowlySlowly
 
Posts: 41
Joined: Mon Apr 05, 2010 10:11 pm
Location: North San Diego County, California, USA
Has thanked: 7 times
Been thanked: 0 time

Re: why no left turn at intersection

Postby slandrum » Tue Jan 28, 2014 5:36 pm

This is now a very frequent occurrence, and I see several reports of it a day now, and run into it myself about once/week. I don't bother adding links to more examples to this thread, as there are plenty to understand what the problem is.
Orange County, CA, USA, Samsung Galaxy S3, Android 4.3 Image
slandrum
 
Posts: 362
Joined: Sat Oct 05, 2013 2:01 pm
Has thanked: 20 times
Been thanked: 85 times

Re: why no left turn at intersection

Postby sketch » Tue Jan 28, 2014 11:20 pm

Staff have actually been collecting data about specific occurrences of this, not sure how much they need, but it seems the more the better. Staff are currently working on a prevention mechanism for this type of thing.
ALL US EDITORS READ: New USA road type guidance
new orleans based • detroit enthusiast • usa country manager
2013 ford focus titanium hatchback 5mt • performance blue
Image Image
sketch
Waze Global Champs
Waze Global Champs
 
Posts: 5714
Joined: Sat Aug 08, 2009 6:13 pm
Location: New Orleans, LA
Has thanked: 1251 times
Been thanked: 1730 times

Re: why no left turn at intersection

Postby aplycon » Wed Jan 29, 2014 12:24 am

sketch wrote:Staff have actually been collecting data about specific occurrences of this, not sure how much they need, but it seems the more the better. Staff are currently working on a prevention mechanism for this type of thing.


are they collecting said data from this thread? if so, should we keep posting all occurrences we run into?
-AP

Paramedic|Denver, CO
Nexus 6P, Android 6.0.1, Waze 3.9.8.0[/size]
aplycon
 
Posts: 59
Joined: Thu Oct 03, 2013 1:01 am
Location: Denver, CO
Has thanked: 33 times
Been thanked: 5 times

PreviousNext

Return to Navigation & Routing

Who is online

Users browsing this forum: No registered users