Just for fun, I pulled up the stats on the 1976 Buick Skylark. That year was the first year for radial tires on that car. If he would have bought his car a year before, it would have had bias ply tires which would have defiantly added to their stopping distance. As it was, driving 20 miles an hour, like a passenger and the driver testified to, they still had the ass end of the car kick out trying to stop. Tire technology saved these peoples life.
GM was big on putting radial tires on their vehicles in 1976. I have a 1976 Pontiac wagon that actually has a badge on the dashboard that say: "Radial Tuned Suspension" just to let people know how exciting these tires were.
