This was more fun to put together than it was to shoot, though neither were bad experiences. I've had something like this in mind after seeing a similar concept photo on Flickr. Decided with the clear skies we had today, I'd give this a go.
Each photo is 12 minutes apart, assembled with no measurements in place (obviously) with Photoshop. No exposure adjustments or colour compensations. Camera Raw imports my photos with a set 30% sharpen for some reason and I don't know how to change that.
There were three other photographers that ended up on this bridge at the same time so that was amusing.