This driver was on 460 west headed from Lynchburg to Appomattox and was weaving in and out of traffic. There were only about 6 cars. Slamming on brakesand then almost ran into a Tahoe as it was turning left. The driver never let up the Tahoe quickly got out of his way. Then he proceeded to pass out vehicle and cut over in front of us and slammed on his brakesfor no reason because there was no traffic in front of him. The speed limit us 60 and this driver has been running 70 the whole time.