In the figure, at time t~1~, the vehicle enters a section, at t~2~ it leaves that section and a predicted speed and in a predicted lane and t~3~, it enters the next section. In Mesoscopic simulation, time is moved to the next event where the event is a vehicle entering or leaving a section or node. In Microsimulation time is incremented by Δt at every time step, every vehicle then considers its speed and lane choice and is moved by the distance determined for that time step. The figure below summarizes the difference between the 3 levels of simulation. In a mesoscopic simulation, a vehicle is considered only as enters and as it exits a road section and the intervening movement is not simulated. In Aimsun Next, mesoscopic simulation refers to a link and lane based simulation of individual vehicles where the level of knowledge of vehicle activity is much reduced from that used in microsimulation. Mesoscopic traffic simulation can take many different forms, some oriented close to microsimulation, some closer to macroscopic modeling and each traffic modeling methodology defines mesoscopic differently. Mesoscopic simulation is a "middle" mode of simulation lying between microsimulation of individual vehicles and macro assignment of traffic flows. Simulation Process ¶ Mesoscopic Simulation ¶
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