My daughter had her neck broken by the shoulder harness in an accident almost six years ago in the front passenger seat of a late-model luxury Japanese import. She is now a quadriplegic who needs total care. I am reminded of that every night when I brush her teeth, do her range of motion stretches, put on her hand and foot braces, etc. Don't kid yourself into thinking that adding shoulder harnesses to the lap belts in antique cars will protect you from injury. The car she was in was engineered from the factory with three-point belts and air bags, all of which worked, but which caused a "hangman's" injury to her second cervical vertebra.