Off-ramp to interchange to on-ramp routing

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Re: Off-ramp to interchange to on-ramp routing

Postby CBenson » Wed Jun 22, 2011 6:56 pm

I agree that this a problem that should eventually be addressed. As you say it may be illegal, its also amost always slower when it routes me off and right back on.
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Re: Off-ramp to interchange to on-ramp routing

Postby CBenson » Wed Jun 22, 2011 5:05 pm

AlanOfTheBerg wrote:The penalty for ramps would not have to be significant at all, but just enough so that if given a choice between a ramp segment and an freeway segment, and both have the same start/end point (not true in real life, but this is a simplified example), then the freeway segment wins.

1 freeway segment > 1 ramp segment, and certainly
1 freeway segment >> 4 ramp segments.


But how do you weigh 1 freeway segment with current traffic data showing a speed of 10 mph against 4 ramp segments with no current traffic data but an average speed of 60 mph. In other words if the penalty is such that 1 slow freeway segment > than 1 fast ramp segment would that create other problems?
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Re: Off-ramp to interchange to on-ramp routing

Postby AlanOfTheBerg » Wed Jun 22, 2011 4:18 pm

The penalty for ramps would not have to be significant at all, but just enough so that if given a choice between a ramp segment and an freeway segment, and both have the same start/end point (not true in real life, but this is a simplified example), then the freeway segment wins.

1 freeway segment > 1 ramp segment, and certainly
1 freeway segment >> 4 ramp segments.
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Re: Off-ramp to interchange to on-ramp routing

Postby CBenson » Wed Jun 22, 2011 2:53 pm

mapcat wrote:The drawbacks probably outweigh the benefits, since they would probably have to penalize only some ramps, and it's not obvious which ones would need it.


I'm not convinced the drawbacks would be significant either. Couldn't waze simply determine that if it wants to route between two nodes over a route that is entirely ramp segments and there is alternate route over entirely freeway segments thats not say more than a mile longer, then it shouldn't route over the ramp segments. I'm not sure what the drawback would be (other than additional processing complexity).
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Re: Off-ramp to interchange to on-ramp routing

Postby Talisker66 » Wed Jun 22, 2011 2:39 pm

Had an similar issue when Waze always routet me thru ramps and crossings instead of simply using a tunnel. I could solve it after I checked the GPS-Layer.
For me it looks that the Northbound lane is slightly off of the major GPS-"Track".
Its similar to my case. I would suggest to move the I5 slightly to the left and the ramp maybe slightly to the right.

Regards
Juergen
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Re: Off-ramp to interchange to on-ramp routing

Postby CBenson » Wed Jun 22, 2011 2:33 pm

mapcat wrote:The drawbacks probably outweigh the benefits, since they would probably have to penalize only some ramps, and it's not obvious which ones would need it. It seems like this would rarely cause problems for users, and I hope that replying to an update request with info about the routing algorithm/average speeds/data-gathering for potential alternate routes would reassure any users who do question it.


I'm not so sure. It doesn't cause big problems, but its an aggravation that does not reflect well on the waze routing algorithm. When I'm promoting waze with friends, I'm never quite sure how to answer the question: "Does it work?" Now that the various routes from my home to work have been edited, waze seems to choose the best route based on the current traffic. However, since I can only take one route, I can't really say for sure.
When waze routes me off the highway and back on again I have been following the directions to see if they will correct. When I do this I can see the cars that are passing me. Thus, the only time I can actually verify whether waze's routing is giving me the better route, it is not. This does not reassure me.

mapcat wrote:Does this happen all the time?


It has only started routing me through the ramp here for the past week or so, but it has been consistent since it started. Before that waze kept me on the freeway. In other cases, I have been able to edit the map to make it stop. But for the example that Alan gave and the current problem I am having I don't see a good way to edit the map to make it stop.
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Re: Off-ramp to interchange to on-ramp routing

Postby mapcat » Wed Jun 22, 2011 1:57 pm

AlanOfTheBerg wrote:Good points, again. Makes me think that ramps should have higher penalty than freeway road type. But, I'm thinking of this more simply than the devs are, probably. I don't know all the drawbacks to adjusting a penalty like that...

The drawbacks probably outweigh the benefits, since they would probably have to penalize only some ramps, and it's not obvious which ones would need it. It seems like this would rarely cause problems for users, and I hope that replying to an update request with info about the routing algorithm/average speeds/data-gathering for potential alternate routes would reassure any users who do question it.

CBenson wrote:I have looked at a bunch of interchanges where this happens, such as the one I linked to above, and this one and the ramp speeds are never shown as being more than the highway speed.

Does this happen all the time?
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Re: Off-ramp to interchange to on-ramp routing

Postby AlanOfTheBerg » Mon Jun 20, 2011 9:34 pm

Good points, again. Makes me think that ramps should have higher penalty than freeway road type. But, I'm thinking of this more simply than the devs are, probably. I don't know all the drawbacks to adjusting a penalty like that...
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Re: Off-ramp to interchange to on-ramp routing

Postby CBenson » Mon Jun 20, 2011 9:31 pm

I have looked at a bunch of interchanges where this happens, such as the one I linked to above, and this one and the ramp speeds are never shown as being more than the highway speed. Of course the routing algorithm may well be using a different speed for the highway during the rush, especially when other wazers have passed through the interchange while in traffic.
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Re: Off-ramp to interchange to on-ramp routing

Postby TerryEasy » Mon Jun 20, 2011 9:27 pm

AlanOfTheBerg wrote:moesterry, I'm with you on thinking Waze should eventually figure it out from average segment speeds. I'm not positive it always does, though.

:D
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