# TRAVEL TIME OF VEHICLE ROUTING PROBLEMS GIVES WRONG RESULTS

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01-27-2014 06:10 AM
New Contributor
Hello,

I have a network dataset with historical traffic.

Every time that I run a vehicle routing problem, the solver gives me results with the time-neutral travel time.

This is not happening when I do Routing. The travel times of routes depend on the time of the day.

What could be a reason for the fact that historical traffic data are only read with the Route option but are not read in the VRP option?

Best,

Fabio
Tags (2)
6 Replies
by
Occasional Contributor
Hi,

VRP solver currently does not support optimization with historical traffic information. So the solutions returned in NA classes are all based on time-neutral time. After VRP solve finishes, you can click on Directions button. It will call Route solver to generate the travel time with the historical traffic information based on the route start time and sequence returned in VRP solver.

Thanks.

Anna
New Contributor
THANK YOU very much Anna
New Contributor
But, even though the solver uses neutral travel time,  the best path is still depending on traffic condition right?  I think the solver knows the streets that have more traffic

Thanks

Fabio
by
Occasional Contributor
I'm not sure where you get the network dataset. Usually, when we prepare the network dataset, we take the weekly average travel speed on a street and divide it by the distance to get the time neutral travel time. If the street has a lot of traffic, the weekly average travel speed will be slower. So even with time neutral solve, VRP solver still knows where the high traffic streets are.

Thanks.

Anna
New Contributor

Hello. In this problem. can solve?

I have a network dataset with historical traffic.

Every time that I run a vehicle routing problem, the solver gives me results with the time-neutral travel time.

This is not happening when I do Routing. The travel times of routes depend on the time of the day.

What could be a reason for the fact that historical traffic data are only read with the Route option but are not read in the VRP option?

Esri Contributor

Hello,

What is described by Anna is still accurate for the VRP Solver. It uses a time-neutral travel time for solving and that is what is returned in the NA classes. The directions will reflect the traffic if included in the network dataset.

Thanks,

Heather