(I) Manufacturers of the first cars saw no reason for a windshield because the car's speed was so slow that there wasn't any wind. (II) It took almost fifty years before the industry began to develop safety glass that didn't shatter on impact. (III) As speeds increased, a circular piece of glass in a frame was placed in front of the driver, but the other passengers were encouraged to wear goggles. (IV) It wasn't until cars began to become closed vehicles with glass all round for visibility that the windshield started to look something like it does today. (V) Even then, many windshields were more like windows and were designed to be opened to let in air.