Headlights can be visible for over a mile, but may only illuminate a less then a couple hundred feet. Just because you can see an approaching vehicle doesn't mean they can see your vehicle. When pulling out of a driveway, be sure there is adequate time for you to get up to speed and into your lane before traffic has to brake or take evasive action to avoid colliding with you. This animation demonstrates how much more time a driver has to percive the other when he has a good view of approaching headlights, but the other driver doesn't.