So... what exactly is the lower set of windows and wipers doing? Dude's knees and ankles need to see? Some tiny little guy rides down there with the driver's feet? I can't quite puzzle this one out.
https://en.m.wikipedia.org/wiki/Douaumont_Ossuary WW1 memorial . Very impressive. Sent from my online shouting device
Its for safety reasons. If someone is standing in front of the cab, the driver can not see them and will run over them. the windows allow vision to the roughly 5' blind spot.