ERROR: there is an issue with the input data, which prevents the methodology from providing valid results. WARNING: this warns users that HCS procedures will adjust some input data to comply with HCM or software requirements. Users may want to review their inputs, but results will still be produced. INFO: these messages provide additional information that might be useful. These include cases where default values are changed or optional inputs are used. Results are produced normally.
If on-ramp vehicles are having trouble entering the mainline or if on-ramp vehicles are reaching the end of the acceleration lane, this can be handled by increasing the percentage of drivers who will cooperate with a merging vehicle. The default value is only 20%. This parameter works with the anticipatory lane change logic to allow vehicles to merge more smoothly.