Yes. I expect they drilled out the holes, fitted the lights and wiring, then attached the cross-piece to the walkway.
I had a little bit of fun with ND Filters and a 30 second exposure on my Nikon D5100 with the 40mm F2.8 micro lens:
At 60 MPH, the cars are moving way too fast for a 30 second exposure to record any hint of them.
I'm sorry the color is a bit off, I used cheap ND filters for this test and they do have problems with color shift.
Bob Diaz
I put my hiking photos into a video:
http://www.youtube.com/watch?v=pD-IcQi_ZSI
Shot with the Nikon D5100, Nikon 18-55mm kit lens, Nikon 55-200mm, Nikon 40mm micro, and the Sigma 10-20mm F4 lens.
Bob Diaz
It looks super Bob. I like your choice of lenses too. The only lens I would trade would be 55-300 for the 55-200