Ansers inline... *JTR router* > > - Does it make sense to define smaller interval sizes, but do not > change the turning ratios in these intervals? > no.
> - What’s the effect of “route-steps”? Does it only affect the > result when different turning ratios are specified for different interval > sizes? > no effect on output at all (it only affects memory usage while processing input files) . > > > *RouteSampler* > > When I apply the RouteSampler.py, I indeed get more uniformly distributed > turning flows. As input, I take the routes previously computed by the JTR > router. However, the overall desired accumulated counts are not correct. I > confirmed this by applying the “generateTurnRatios.py”. For example, at a > specific intersection (two unidirectional links crossing) the turning > ratios should be 50% for each leg. In contrast, I got 47% and 53% after > applying the routeSampler. I apply the “—optimize full” option, and the > interval size does not seem to have a big impact. > Does routeSampler report on the mismatch (GEH > 0)? If so, the candidate routes did not allow satisfying all constraints even using optimization. > - Does it make sense to reduce the counts for early intervals at > intersections where it takes some time to load the network? > No. because routeSamper does not take into account the time it takes for vehicles to reach the intersection. It assumes that flows are stationary in each interval. This may be a source of counting deviations looking at the simulation counts in smallish intervals. > - Are there any other ways to reach the desired turning ratios? > First you need to figure out the source of the mismatch: - constraint effects:routeSampler reports that it could not match all the counts - temporal effects: only simulate a single interval and sum up counts over the whole simulation, if the counts fit then the effect is temporal regards, Jakob
_______________________________________________ sumo-user mailing list [email protected] To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/sumo-user
