The auto steer in my tesla model 3 failed today when the car was turning on a curvy downhill road. i believe it's because the lane markings on the right side ended just before the curbing started. the car suddenly turned right and hit the curb brushing the right front wheel. it would have been a fatal accident if i hadn't taken over. auto steer technology is not yet ready for use on all the roads and it should not be included by default in all the tesla models. my car did not brake because the cruise control was still on. i am still in shock and afraid to use the auto steer again.