Hi John, whilst I believe Steve Howsley is essentially correct in that "she was wrong" the explanation is anything but "pure and simple". I believe Steve Logan explained it better; "The limo experienced rapid deceleration due to Greer lifting his foot off the brake while driving at parade speed in first gear. The limo never stopped but the motorcade behind it did." That may certainly have given the appearance that the lead car also stopped and explains the mistake. Unless you believe in the film alteration theory, it's quite clear the lead car did not stop but just slowed down.
I also think Steve Logan explained it better. To be honest it's an issue that is simply not worthy of discussion hence my dismissive response. Sure, there's been speculation that the car slowed down due to braking or easing of the accelerator but to suggest the car stopped for full
seconds as the witness claims is simply ridiculous.
Maybe she experienced one of those intense episodes where it's like time stands still. That could at least mean she's not lying and isn't necessarily a weirdo.