Automatic Transmission problems of the 1999 BMW 528

The transmisson failure nearly resulted in an accident when the car stopped in the middle of an intersection and I was nealry hit in the drivers side. The horn failure nearly resulted in an accident when a woman began to drive into the side of my vehicle - I had a car behind me so I could not apply the brakes instead I saw myself clear and crossed double solid yellow lines on to the oncoming traffic side in order to avert an accident. That was the first timei ever had to use the horn in the vehicle and it did not work.