I have a street network where there are two very closely spaced intersections. Vehicles enter on one particular approach, turn right and enter the link between these two intersections. But at the next intersection they turn right, however, I want to have them go thru as the field data shows for this location. Is there anyway to prevent the vehicles entering the one intersection from turning right at the next intersection?

Hi Grant,

There would be a way to modify this behavior. Back in Synchro, double click on the link between the two close intersections. For the desired direction, click on the Link OD button. You'll see a bunch of rows and columns. For the row 'From right weight' go across to the column 'To right weight'. Make this weight factor zero. Now, zero vehicles will make a right and then another immediate right.

John.

John Albeck
Trafficware

John:

Thanks for the direction. I tried that and it worked perfectly.

What I am doing is creating a roundabout simulation, and it is working pretty good, but there is one more parameter that I would like to see go a litle farther than is allowed: gap acceptance. I believe that in a roundabout the gap acceptance factor should be lower because of the 15 mph speeds of vehicles in the roundabout, and because it is therefore a little easier to "jump in" to that traffic stream when there is even a fairly "small" gap (relatively speaking compared to a four way intersection). Any suggestions?

I have already tried modifying the driver parameters in Simtraffic to make all 10 vehicle types "aggressive", which really doesn't look too aggressive in a roundabout, if you know what I mean. At a signalized intersection, I can see why it would be aggressive to jump into a stream of traffic moving at faster speeds, but not at a roundabout where "cross traffic" speeds are low and traveling in a circular path as well. A sideswipe is about the worst potential accident, and so I think that the gap acceptance factor should be lower than the lowest 0.75 allowed in the software. If that were the case, I could get my results to match better what is happening in software like Arcady and Rodel. Thanks for your help!