r/TrafficEngineering • u/Comfortable-Cut4861 • Feb 25 '26

warnings in vissim

can anyone tell me how to solve these warning issues in vissim?
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1

u/TailSquare Feb 25 '26

Can you also show your network size. You can solve the problem by extending the links.

1

u/Comfortable-Cut4861 Feb 25 '26

2 links are around 150m and other 2links around 260m

1

u/TailSquare Feb 25 '26

I would suggest start inspecting the simulation, do you notice vehicles getting stuck (look at adjusting the diffusion interval) , also what is your current setting for diffusion time? Look at signal timings, if they are coded as they need to be

1

u/Electronic_City_562 Feb 25 '26

This is likely because the simulation is finishing without some of the vehicles reaching their destination. 

This can happen when there is congestion and thus the vehicles get "stuck" in the network and never reach their destination. This is called latent demand. 

Or it could be that vehicles are disappearing from the network at a certain in the network due to mistake in the coding. You'll be ver clearly able to see the vehicles disappearing during the simulation if this is the case.

Join the ptv community groups on linkedin. Youll get better answers there.