At G.M.'s proving grounds outside Detroit, Chevrolet General Manager E.
M. ("Pete") Estes last week presided over a demonstration of '67 models, then got into his new, chauffeur-driven Caprice and headed back to his office.
Fifteen miles down the road, he was involved in a minor accident. Uninjured, Estes stepped out and said to people who had gathered around: "See? I might have been hurt if I hadn't worn my seat belt."
Estes' statement was symptomatic. Four weeks ago, Chrysler unveiled its '67 models; last week came Chevrolet, Buick, Pontiac, Oldsmobile, Ford and...