Making Tracks

Looking forwards to work today and I had to trudge through two inches of slush on the way to the station. My shoes look like I have been marching through muddy fields.

Following the tracks, I was trying to work out how many people had gone down the path before me this morning. I figure:
1 Man very early (faint footprints) who scuffs his heels
1 Man and his dog
2 Bikes
1 Man coming the other way
1 Man
1 Lady
1 Rabbit (far right)

... that just leaves the parallel tracks - can't be a bike because the tracks aren't right. A scooter perhaps - but then you'd see single footprints. Any ideas blippers?

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LOTD: Life Through A Lens's snowboard jump blip is a great action shot.