View error logs to see where vehicles are being denied entry.

Verify denial of entry is not due to coding errors (e.g., incorrect lane assignments, signal timing errors).

Extend geographic limits (spatial) of the network to accommodate the maximum queue lengths.

Extend time limits (temporal) to accommodate the traffic demand. Typically, the analysis begins before the onset of congestion and ends after congestion dissipates.

If the previous steps do not resolve denial of entry, the model results are typically adjusted to account for unmet demand in the analysis outputs. Unmet demand delay is typically reported as a separate category to served demand delay.