reverse snorkle intake

Can anyone help me with an answer to this question?

I was travelling home from work in Canberra and a Patrol (I think) passed me and had the intake of the snorkle pointing to the rear. I do not know if it was a local or someone passing thru on their way home from the snow. Can anyone give me an explanation for this? Maybe the owner will see this post. Is it a cold air thing, if it is, for those based in the cooler climes is it something we should be trying?
Your views would be appreciated.

I am also the owner of an new explorist 600 (50th presssie from the wife and my mates) I am coming to grips with it but if there is anyone in Canberra area who is well versed with them and who wouldn't contacting me to give me some tuition on getting the most out of it, would be appreciated e.g. downloading waypoints from explore oz treks etc. Am doing the Flinders in Feb/Mar 08.

I am not a regular poster to the forum but I do find a lot of invaluable tips and suggestions contained within the postings. Their is a lot of knowledge ot there.