Lights on 235

When I was taking my photography class we were

 experimenting with taking action pictures.

 I convinced my husband to come with me to take pictures

one evening over I-235. I lay down on a pedestrian bridge

 to position my camera on the ledge under the fence.

 I set the shutter to be open for 20 seconds.

Then I just let the camera do it's job and this is the result.