It depends on the situation. If you have had a breakdown and have to hoof it (which normally shouldn't happen anyway--you should be prepared to hold out until

It depends on the situation. If you have had a breakdown and have to hoof it (which normally shouldn't happen anyway--you should be prepared to hold out until you're reported overdue and they're looking for you) you could be in a situation where you know ahead is shorter than behind. That assumes you know where you are and what the roads around are like.