Error Proofing Runways

USATODAY.com - Runway safety system has pilots seeing red

This counts as "everyday lean" if you fly a lot like I do. A system like this seems long overdue, a system to prevent pilots from taxiing down occupied runways.

In the link above, there's a nice video that illustrates the use of error proofing (poka yoke) and visual controls in the context of an airport.