Why does the CORSIM output file show instances of the following warning messages: “Vehicles missed destinations – vehicle number…”, and “Computed leader…”?

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Why does the CORSIM output file show instances of the following warning messages: “Vehicles missed destinations – vehicle number…”, and “Computed leader…”?

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The message regarding missed destinations states that a vehicle was unable to get to its freeway off-ramp and missed its destination. In this case, the vehicle will be rerouted to the next off-ramp downstream. This will change the percentages of vehicles exiting at those off-ramps. You should try to determine why so many vehicles are missing their destinations. Consider off-ramp warning sign locations and any messages from CORSIM about vehicles not having acceptable candidate lanes to travel in. The computed leader warning message indicates that the FRESIM lane change logic broke down, possibly because of incorrectly specified connections between freeways.

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