Oskar went through the same phase. It was terrible! I remember pulling over on the side of the highway with trucks zooming past so I could settle him. I'd almost be in tears myself because it's certainly not easy to drive and not be able to help your little bub. I don't have any suggestions I'm sorry. Oskar grew out of it and I think that I just limited my trips a little and kinda did smaller but more often. Like down to the shops to get veg for dinner type things and over time I think he just got used to it. In fact, now EVERY day he comes to me and says "go car" over and over...lol. He mostly loves it now.