“A man who breached security controls at Newark Liberty International Airport, resulting in major delays and grounding flights for six hours, left a terminal about 20 minutes after he entered the wrong way through a security checkpoint, the Transportation Security Administration said Monday.” read the article for more info.

If you have flown recently…. who could miss the sign that states do not enter here? Next to the sign is a blocked corridor and a guard… right? Very few airports that I visit have a guarded corridor. So for those who have attended a TapRooT® Root Cause Analysis course, the first issue you would identify is whether a sign is an effective control.

In this case, a passerby notified security about the breach, so the sign did not work. If you truly want to reduce the hazard of uncontrolled entry to an area, signs are definitely not enough.