My SAT's weren't on campus. It was on some other campus I never heard of on the other side of town. I biked the school but without a parent would have needed to trek across town on a saturday morning (easily 20+ miles, in the mid 00's right before smartphones would just provide a GPS, so I'd be juggling printed MapQuest directions on a bike) to get there. I'd be cutting it if I took a bus since they ran hourly and I believe the weekend buses started at 8Am for a 9AM test time.

Also note that I could drive by this time but we only had one car between my mother and I.