1, the windshield is the 1920s Ford whim, the two pieces of glass together, with a layer of PVC plastic separated in the middle to make a similar sandwich of glass. This technology is still used;

2. As early as 1919, "horseless passenger cars" were few in number and operated at a rather slow speed. When they were on the street, they didn't have windshields;

3, in order to protect against bad weather, insects and other debris on the road, drivers and passengers generally use goggles. Imagine driving at high speed in a car without a windshield.

4. As motor vehicles became more common and faster, wind and small debris hitting drivers in the face became a growing problem.