My generation will understand this:
If you leave the house late for work, you can make up time by avoiding certain streets or lights. You know what lane to drive in on the freeway; how to weave through traffic to make up 5 minutes. But please, oh please, don't be 5 minutes late to work for any reason. Your kid throwing a tantrum? Too bad. Your car won't start in the cold? Too bad. Woke up with a massive headache? Too bad.
If you leave the house late here in southern Mississippi, chances are you are just gonna be late. Since there are only two or three lights anyway, you can't avoid them. If you know the back country roads, you might be able to speed around and make up a little time. Mostly, people are just glad you made it!