Discription of Events: The 2014 Mercedes-Benz CLA was observed at a four way intersection on South Mill Avenue and East 5th Street in Tempe, Arizona, 85281. The incident occurred around 4:47 P.M. Arizona Time on December 3rd, 2018 on a four way intersection on South Mill Avenue and East 5th Street. Possible VIN number is WDDSJ4EB1EN035363. I observed the driver of the 2014 Mercedes-Benz CLA in front of the Tempe Orbit Shuttle Bus. Both were facing EASTBOUND. The driver was in the drive lane when the driver decided to make a left turn in a wrong lane. The driver of the shuttle bus honked and the driver of the 2014 Mercedes-Benz CLA waited for the other cars to move up on South Mill Avenue NORTHBOUND. After the vehicles moved up NORTHBOUND on South Mill Avenue, the driver of the 2014 Mercedes-Benz CLA moved forward and turned left onto the NORTHBOUND direction of South Mill Avenue. I also observed the driver of the 2014 Mercedes-Benz CLA sticking his middle finger from his driver side of the car. The driver of the shuttle bus stopped honking a few seconds after it passed the car and continued EASTBOUND, the same direction I was traveling on.