Comment I think Elon missed the real reason.... (Score 1) 145
In the slow motion video, I saw of the practice, the door was cushioned by towels. When the ball hit the window, the ball bounced off, and the door bounced open a couple inches.
The reason the ball broke the window on stage was the window was held in a much more rigid frame and there was no place to flex.
That said.....
Most trucks sold in the US use tempered glass for the side windows. If you throw a ball at them, they are going to shatter into a thousand pieces, and the ball is going to end up in the drivers lap.
In this case, the ball was not able to penetrate.
There are several high end cars that have adapted similar technology, where the side windows are made of the same time of glass the front windshield is composed off.
This is done for two reasons:
1. Car burglaries of Cybertrucks, may be less common, because the thieves have a harder time getting through the windows.
2. In a vehicle extrication situation, fire departments will have to use techniques similar to removing the windshield, to get to the people in the vehicle.
My hope is that, with that big windshield, the glass is tough enough to resist rock chips.