Driver swerved across lanes to run a red light, flicking off the drivers behind him with his middle finger. A driver honked and at the following intersection he swerved back in front of them, threw the middle finger again and slammed on his brakes in the middle of the intersection trying to cause an accident. He then swerved back into traffic and 2 blocks later made a laft hand across 2 lanes of traffic woth no signal, slowing or warning.