I think i read somewhere that the information about the car and the rust was from the actual time she disappeared but for some reason they have only just decided to put it out there now 17 years later. It's not new information apparently, but i'm not 100 percent sure on that. I agree though about them noticing it in the first place. We are told over and over that when she was walking along the road it was pouring and storming with rain and was pitch black darkness. I find it strange that these motorists were able to even spot Asha in the first place (including her colour of clothes and the fact she was wearing a backpack) given the conditions, let alone rust around the wheel wells.