They can't choose to leave because we aren't playing well, or leave when we have the game all bagged up because they want to beat traffic home. Stay the entire game, and show your appreciation for their hard work, rather than showing them your backside as you are scurrying to get home. You're going to be sitting for 20 minutes in the cold parking lot anyways, whats 2 more minutes in a warm building?
The thing is that if you are ready to leave right when the final horn sounds, you WILL beat most of the traffic home. There's a HUGE difference in your travel time home whether you leave right at the buzzer or if you wait until after the band has played the final fight song. I'm not condoning heading out early on our team or leaving at the under 4 timeout, just saying that this myth about "not making a difference in travel time" is completely false.