Any time someone runs to get in their car to follow another person who is already driving in their car and proceeds to follow them for several miles through a big, busy city and manages to stay up with them.
The car following manages to catch up to them in this busy city, is never in the wrong lane when the car in front makes a quick turn, and the car following never gets held up by red lights or congestive traffic. They just manage to stay with the car in front all the way to their destination.
There's no way that happens.