Depending on your profession and where you work, you may find that you're able to commute via bicycle. For many people, this is more efficient than driving their car or taking public transportation.
As a pedestrian, you'll constantly find yourself in close proximity to moving motor vehicles. This holds true when jogging around your community, strolling through the parking lot at the mall or walking to work.
As a driver, it's important that you never become too comfortable with your surroundings. Instead, you must remain alert at all times.