Wrong routing when using stops

[kuduboet]

Shorter route checked??

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I am guessing he is questioning is shorter route checked in the settings but looking at it either way, green looks shorter. Doesn't make sense to me either. Strandloper, they may be taking you past a scenic vineyard based on where you are


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[strandloper]

Referring to the map below.

If I leave point A and select point B (where I drop my son at work) as the destination, the route suggested is the green one with minor variations for traffic.

However if I set point C (where I work) as the destination and point B as a stop, the suggested route is the red one, followed by either the blue or purple one depending on traffic.

The red route is several kilometres longer than the green one and takes five or more minutes longer to drive. It should therefore never be suggested as the best route between A and B, whether B is set as the final destination or as a stop.

It would appear that when choosing a destination with a stop the route calculation is not done as best route to the stop then best route to the destination but as the best route to the destination with a deviation to the stop, which may not provide the best routing at all.

waze_stop_bug.gif

(234.55 KiB) Downloaded 1984 times

[sketch]

Here's an example where it gets it totally and blatantly wrong:

[ img ]

The endpoint is a house at the right edge of the screen. The via point is the airport in the top left.

The route to the airport should have taken me straight down the interstate to the airport.

Instead, the route took me off the interstate, down Causeway, up W Esplanade, back up Clearview, and back to the interstate. That's 10 extra minutes, for no reason whatsoever.

I've highlighted the incorrect route in green, and the correct route in yellow.

I've seen some pretty bad via-point routing, but this is a particularly egregious example.

As far as I can see Waze loves its routes. So much it will only calculate the shortest possible deviation from the original route when adding a stop. When you pick your destination a calculation happens and the resulting route is the one used for the trip. Adding a stop will not cause a recalculation for the entire trip.

When a stop is far off your route it is more efficient to set the stop as your destination and the set the new destination when you arrive at your stop.

I've seen that, to an extent, but Waze is far more forgiving when a stop point is not set. We'd be better off if the two routes should be calculated separately and then added together.

[crazed_out]

Thought I wrote this already but can't find it so I'll write it again.

As far as I can see Waze loves its routes. So much it will only calculate the shortest possible deviation from the original route when adding a stop. When you pick your destination a calculation happens and the resulting route is the one used for the trip. Adding a stop will not cause a recalculation for the entire trip.

When a stop is far off your route it is more efficient to set the stop as your destination and the set the new destination when you arrive at your stop.

It's kind of counterintuitive, but that's what happens. Adding a stop should trigger a routewide recalculation, and until it does this is what we have to live with.

/Anders

[sketch]

This has been happening to me as well. Waze gave me a route to a stop on an interstate with 3 mph traffic, with an estimated time to arrival of 18 minutes or so. I started to drive in a way that I knew to be much faster, but it tried over and over to take me on the interstate. After driving away from the interstate for about two miles, I started the route over again, and it gave me the better route with a much shorter ETA (9 minutes instead of the 18 reported before I cancelled the route).

I've had similar things happen over the past few weeks. I use the stop feature somewhat often.

[jwkilgore]

Ok, I'm not the only one. I live in East Brainerd, TN (location H), and work in Chattanooga, TN (location W). I drop off/pick up my kids at my ex-wife's house in Hixson, TN (location X), on the way to/from work. The three locations form a rough triangle, with a major obstacle (TN River) across two of the legs.

If I'm routing from any of the locations to any of the other locations it usually does OK. But if I'm routing to one and add the other as a stop it's not OK. It's like it routes me to the stop, routes me back to the location where I deviated from the original route, then continues to the original destination.

So say I'm leaving W to go to H, and add X as a stop. Waze routes me from work across the TN River to Hixson, then it routes me all the way back to downtown (across the river again) before proceeding home. This about a 50% increase in miles.

[strandloper]

Last week I was trying to route directly to the stop first then the final destination. It would start off suggesting the green route except that it wanted me to turn right from the N2 into Lourens (a block before Victoria), over the river, left into Sargeant then right into Victoria. As there are no lights at N2 & Lourens turning right across traffic there is often slower than turning right from the N2 into Victoria. Experience has also shown that there can be quite a hold-up turning right into Victoria from Sargeant so I tend to ignore this unless there is no other turning traffic ahead of me as I approach Lourens.

As soon as I pass Lourens, ignoring the suggested turn, Waze recalculates and switches to the red route and the ETA increases by four or five minutes. Once I ignore this and turn right into Victoria it switches to the green route again.

Assuming perfect traffic flow the green route is definitely better but as I found the other morning there was a hold-up on Victoria that lost me five minutes, so on that day the red route might have been faster. However there is just as much chance of delays on Broadway leading to the Lord Charles intersection so there is really no way to know which route will be better on any given day.

As you say there is probably just not enough traffic data for Waze to be totally accurate with routing in the area.

[RodNav]

I was reading this thread out of interest because with my new phone I can finally use the latest waze instead of the old symbian version , so I've started exploring the 'Stops' function. When I noticed the name 'strandloper' I thought: "Ah, another South African". Then I looked at the map again and realized that I live almost in the centre of that map, near where the 3 routes converge!

I have found that routing to my house from the Gants area (in the general area of A) it sometimes suggests the red route. If I try again it will sometimes change to a route similar to the green route. I agree that the red route will normally take longer, but since the turn from the N2 onto Victoria St (where Green and Red diverge) sometimes takes a long time, and there are more traffic lights and traffic on the green route, the difference in route times may not be as significant as one might think. Possibly waze still needs to get more speed info from wazers driving those roads to be more accurate.

But all of this does not explain why you get the red route only when selecting a Stop. I have just tested with my phone and can confirm the behaviour you've reported. (I have 'Fastest' selected). I guess it must be the issue mentioned in the link TonyG-UK posted. So I guess you should keep trying the Stops function and see if it comes right again.

[Arnoniem]

I'm having a similar issue here in the Netherlands, last week.

When I select a gas station exactly on my route from work to home, it sends me 5km around it. Even when I was only 800 meters away, it was still sending me a 5.4 km route to the gas station!

Don't understand why.

[strandloper]

That could be it. I was using the same destination and stop before going on leave over Christmas and it worked fine. It's only since I've been back at work (since 7 January) that I've been seeing this behaviour.