The driver was parked on the side of Topanga Canyon near PCH and out of his car in the middle of a busy street. As I was about to pass him, he got back in his car. He then started driving very quickly on the shoulder of the road, and, without signaling, swerved directly into me. This forced my car into oncoming traffic – he then began picking up speed at an aggressive pace and driving directly next to me in an attempt to overtake my car and I was stuck in the opposite lane on a very busy and fast single-lane road for several seconds. I have never witnessed such blatantly reckless and erratic driving in my life, and I have never felt so at risk as a result of the conduct of another driver. The driver appeared to be an older man with sparse hair and on the larger side.