Everyone hates traffic.
Traffic conditions can make or break your morning commute, so why not get a head start on days when traffic is heavy?
One of the great things bout the iPhone is that it often anticipates your daily activities and offers suggestions. If you normally drive to the same place each morning, it will start off your day by telling you how long it will take to get there based on current traffic conditions.
Taken to the next level, if the phone knows how long it will take to get to work, it should also be able to anticipate when you need to get up early to compensate for a traffic jam. Conversely, if traffic is lighter than usual, why not let you get a few extra winks?