Loop 360 light trails

The Loop 360 Bridge (formally known as The Pennybacker Bridge) is both an Austin landmark and a beautiful structure.  I have shot it many times and always enjoy it.  This shot is actually from Christmas Eve in 2009 - I just came across this project in Aperture and realized I have many shots to process from that evening that I had completely forgotten about.  So, hopefully I will get to them and get more shots of this wonderful bridge posted.  I had been at the top of a large rocky overhang, where everyone goes to shoot the bridge, but had finished up and was walking back down the hill.  About midway down there is another trail and so I headed over there in the dark to try out a few things.  This was a single exposure, 10 seconds at f/5.