I was driving at about 5 MPH and about to go onto the Freeway on ramp in Riverside, California, when the sensor in my car went off and locked the brakes, causing the person behind me to rear-end me. This is not the first time this has happened with this vehicle. Luckily, I was not injured, however, this could have been a serious injury if I was traveling at a higher speed or under many other circumstances.