Try to avoid situations in which you may become vulnerable to an attack or assault. Parking lots, for example, are key areas in which criminals attack. It's important to remember where you've parked your car. That way, you're not wandering around, making yourself an easy target. If your car is a great distance from the entrance to your place of business, ask a security guard to walk you to your vehicle.
Awareness is also key.
By being observant, you can avoid risky situations and possible assaults. If there is anyone suspicious nearby, don't go to your car. You can easily call a security guard. Also, be especially sure to look into your car before you get in it, because someone may be inside it. Although we tend to think of parking lots as likely scenes of attack, they aren't the only places that assault can occur.