<p>The FAA is currently studying the effectiveness of these stop lights on runways and taxiways at LAX as well as Dallas Ft Worth and San Diego. The Premise being that if you see red, don't go. As you can see from the photo, they seem to work pretty good. Once the red lights are extinguished, we still require clearance from Air Traffic Controllers. 
</p><p>More information the you could possibly need is found here...
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/44389375@N00">Shawn</a> from Airdrie, Canada
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/cdnav8r/3702745002/">Runway Stop Lights on 24L at LAX</a>