Thread: iGO route calculation logic

OK, I see that somebody discovered the temporary solution but this is not a solution. I think that we face here a bug, let me explain why. I chose another car, lorry which has already set maximum speed 80km/h and the problem is corrected as indicated, but this is corrected because on the highway where the maximum speed is 130km/h you can drive with your car with maximum of 80km/h. in this case "fast" cant be faster on the route with highway than shortest distance.

Let me show you the problem faced by me, this is why I'm here now on this thread. I set a route between A and B in fast mode with a car having maximum 130km/h. The result was 125km in 1h50. After spending time at destination I set to go back from B to A with same mode fast and my car with maximum 130km/h. The result was 165km, different route in 1h47. The question is, why fastest route is different from B to A than from A to B? In reality that was was not fastest at all, just stupid calculation, and it is not normal to modify maximum speed to lower because I will not have fast routes anymore including highways.

I found the problem, the presence of *.ftr files is the problem. If I delete ftr files the fast mode works great even if the maximum speed is set to 130km/h. I hope this will also help you to solve the anomaly. It is not normal to affect my route as soon as I didn't chose a truck.

Originally Posted by BIRBANTE

I do not think so.

The softwares base their calculations only on the maximum speeds allowed in the various roads and not at the maximum speed you assign to your car. The softwares are made to respect, and make you respect the limits and the road rules.
I tried to calculate a route of 140 km, almost all on the highway, duration 1 hour and 50 minutes. After I changed the max speed set for the car from 130 to 190 km/h and I had the same route calculated again...... nothing has changed ....

Let me open your mind. It is right that if you change 130 to 190 nothing will be changed, because even if you have a car which drives with 190km/h the calculation is done according to roads limit, 130km/h for a highway. But if your car is old and the maximum speed is just 90km/h even if you drive on highway the GPS will calculate with your maximum speed 90 instead of 130 but in the city it will be 50 instead of 90 because the route limit is higher priority than car maximum speed.

I hope you understand and now it is more clear.