Monash freeway inbound - right middle lane from Ferntree Gully rd until well over Warrigul rd. The smell is extremely strong and the area is about 50cm wide. I was constantly looking over at it waiting for it to stop but it just continued further and further on. I only got on at FTG rd so it could possibly start further back so be on the lookout. I hope someone can confirm what i saw because it i still can't believe how big this thing was. Cheers.