The last time I was there was in March of last year, and we had a bit of activity. We were on Fitzsimmons by the tracks, about 1 AM with negative wind chill. Three of us (me included) were near the reflectors on the signs there light up briefly like a car headlight had illuminated it, but there were no other cars on the road then. Nobody in the group had flashlights so it wasn't any of us that did it. We did feel a bit of a gust of wind, like something had passed by right after that.