The number one reason drivers pull out in front of you, or even a pedestrian steps out in front of you, is they simply don't know you are there. The art of defensive driving is watching others and being prepared if they rush out in front of you. That art can be made easier through the practice of eye contact.
What is eye contact? Simply put - look at other drivers and pedestrians within your field of vision to try and make eye contact with them. If you don't make eye contact then the safe bet is on the fact they don't know you are there and may act on that misinformation. If you can't make eye contact, then assume the person is going to pull out or step out in front of you. Be prepared for when this happens.
Defensive driving is always critical to safely driving on the road but looking ahead and making eye contact with others can be that extra warning you need to stay safe.