I was looking over the SimTraffic 6 Reports and noticed that at 4-way intersections with minor street right-in/right-out only, SimTraffic is reporting a delay and volume (although very small) for the minor street through movement. Why is SimTraffic reporting a delay and volume for a movement that does not exist (Synchro is coded with only right-turn lanes)? Also is there a way to remove the delay from the average intersection delay calculation and from the report?

This situation also occurs at T-intersections for the minor street approach, where a 4-leg is not coded in Synchro.

Hi,

It's hard to say for sure without the file. But, my guess is there is a sink node. That is, the volumes upstream are higher then the downstream node. These vehicles then go into a sink and are reported in the through column at your downstream intersection. The solution would be to balance the volumes between intersections. Then, it won't be included. If this doesn't seem to be the issue, please email me the file for further investigation.

Thanks,

John.

Has this ever been discussed further? I am running into a situation where a 4-approach intersection (where one approach has 0 vehicles) is producing different delays than if it is analyzed as a T-interesection.