Looking at doing a half lap from Melbourne, originally we intended to do the traditional anti-clockwise but we now think leaving Vic. in late March and going clockwise might suit us better as we "get going" a bit earlier without arriving in Darwin too early, (we want to do Mindil Beach etc)
I know the thinking is you get prevailing wind assistance across the Nullarbor but I have read on this site that some get massive headwinds coming down the WA north coast so is it really a huge consideration which way you go?
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We have been both ways several times, we have had head/tail/side winds in each direction. Plan your trip according to where you want to be when, not on winds that change direction regularly.