I dunno, that area makes sense to me, especially for a solo operation. You want to drive as far away as possible but you want to minimise the time you are missing without an alibi or can be discovered with a body in your car. On those roads you can see cars coming from a long way off. There is a lot less traffic than nearby the airport. The place where Warrant Brands was is really trafficked, that area is really busy now during the day, the new roads around the airport have lots of through traffic.
But around where they are searching you've driven about 35 minutes but it is still somewhat familiar - most people I know around here have connections with people in or around Sunbury, as a lot of people move there for cheaper housing after growing up around this way or travel in for school or work, and we know his son is in Digger's Rest. The only thing that doesn't make sense to me is why you wouldn't go into the Lerderberg State park, except for the fact I have lived here all my life and I've never been into there myself or been told by anyone they've gone there. If we drive up that way to do something we go to Gisborne, Macedon or Woodend.
Anyway the psychology of it is interesting, you are from around here and find it odd whereas I find it almost too obvious a place and so should have been avoided! Especially since it was so well publicised where Jill Meagher was left.