Robert M. Gary wrote:
I heard some retired commuter pilot on the news last weekend suggesting
that the only way to prevent this in the future is to put traffic lights
(stop / go) on the end of every runway.

I saw this demoed somewhere (but I don't remember where). It was pretty
cool. There was a row of read lights across the taxiway access to the
runway until cleared for takeoff.

This is used some places. After a spate of Runway Incursion accidents
(well like five years later, even the FAA's knee jerk reflexes are slow)
the FAA did all sorts of things from pilot education, ATC procedure
changes, charting, signage, ground radar, and lights to try to diminish
runway incursions.

It's amazing to me that sort of stuff SHOULD have applied equally to
the "WRONG RUNWAY" (how to you avoid incursions if you don't know which
runway you are turning onto?). Didn't seem to have worked.