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What causes fatal errors 6197 and 6198?

April 26, 2017causes errors FATAL

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What causes fatal errors 6197 and 6198?

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Fatal error messages 6197 and 6198 are often caused by a missing record type 25. Off-ramps are defined by record type 25. For the freeway mainline link, record type 25 must be coded to indicate which node receives off-ramp traffic. Without record type 25, CORSIM cannot locate the off-ramp destination node. When all of the necessary record type 25s are entered, this allows the origin-destination inputs on record type 74 to function properly. These errors can also be caused by specifying a destination node that is not the upstream node of a mainline exit link or the upstream node of the first link of an off-ramp.