I am still convinced that Gerard had scouted around the local area - prior to the 19th of April 2012 - to find the best spot to dispose of a body. It seems unlikely that he would have discovered such a suitable spot in the middle of the night, and straight after murdering his wife. How did he know that the bridge: had a place for a car to pull in, had a ledge which a body could be rolled off, and where a body would land in a place where it would not be washed away into the river, not be found too quickly, and not be easily seen from the road above? To my mind, this all indicates PRE-MEDITATION. If Gerard disposed of Allison's body at the bridge as Todd Fuller described, then he must have already known these details about the bridge, I believe.