Yes, leaving headlamps on when parked is incredibly dangerous as it blinds oncoming traffic. One of the first fatal accidents that my husband had to attend when he first became a traffic officer was that of someone, who lived in our road. He had stopped to see to an injured badger on the side of the road with his children and was killed by an oncoming car, whose driver was blinded by the headlamps on main beam on the wrong side of the road. Such an unnecessary death and distressing for all concerned.
