A is negligent, B is not. Imputed negligence’ means that, by reason of some relation existing between A and B, the negligence of A is to be charged against B, although B has played no part in it, *14 has done nothing whatever to aid or encourage it, or indeed has done all that he possibly can to prevent it. The result may be that B, in an action against C for his own injuries, is barred from recovery because of A's negligence, to the same extent as if he had been negligent himself. This is commonly called ‘imputed contributory negligence.’ Or the result may be that B, in C's action against him, becomes liable as a defendant for C's injuries, on the basis of A's negligence. This is sometimes called imputed negligence. More often it is called vicarious liability, or the principle is given the Latin name of Respondeat superior.' Prosser, Law of Torts, 4th ed., s 69, p. 458 (1971).