Homeland security alert levels:
Red, Orange, Yellow, Blue, Green.

Passengers are instructed to use the line cooresponding to their alert level color. Terrorists in the Red Line, drug smugglers and cute women who want to be groped by our inspectors in the Orange Line, business travellers in the Yellow line, grannies from Iowa and card carrying republicans in the Blue line, and airport employees (including undocumented workers and convicted felons) in the Green line.

That will make the TSO's job much easier in this critical environment.