I have a network in which a major intersection is very congested, and blocks a lot of traffic (I get significant denied entry numbers, which is OK because I know why). I am wondering what will happen to downstream intersections though - will SimTraffic generate mid-block vehicles (as I have observed in other cases) to ensure that the assigned turning movements are still satisfied as much as possible despite the lack of supply from the upstream node, or does it really reflect the blockage and therefore the expected downstream demand is never realised?

I feel like this should be obvious but I'm missing something... I suppose I could construct a test to figure this out but I think the answer will be readily available here.

Thanks!

Hi Don,

Sorry I didn't see this message earlier. Usually the system notifies me of the message.... but it didn't for this one.

On the question, the latter is true: "the expected downstream demand is never realised". You'll want to compare your Vehicle Exited simulation output and compare this to the value you have input. If this is less, then upstream metering may be the case. Sometimes, a node way in the middle of a network may not realize the demand volume due to metering.

- John.

John Albeck
Trafficware