Polarized filters that large would be very difficult to pull off, especially on a curved windscreen. To manufacture them, they essentially make a 'concentrated'

Polarized filters that large would be very difficult to pull off, especially on a curved windscreen. To manufacture them, they essentially make a 'concentrated' polarizer of smaller crystals and then physically pull the substrate to size. Many other ways exist, but your 3-D movie glasses are flat for a reason. Also, polarizers cut the incoming light by exactly half, so it acts as a tint, illegal in most states for the front windshield.