On 2 separate occasions, while driving on a multilane highway in the city, a car to my left started coming close to me wanting to get in the lane I was in. As the cars came closer, I veered to the right so the cars wouldn't hit me. They continued to get closer to me so I jammed on the brakes so they wouldn't hit me. On both occasions the car did nothing to avoid a collision. I was in manual mode. Why didn't the car sound an alarm and/or veer to the right on its own? The car did nothing.