Infrared reflective windshield

The infrared reflecting glass prevents the vehicle interior from becoming too hot. It also blocks radio waves up into the gigahertz range.

To enable operation of radio-controlled equipment, e.g. toll recording systems, areas on the windshield are permeable to radio waves 1. In these areas, you can install radio-controlled systems.

These areas can best be seen from outside the vehicle by observing the light reflected off the windshield.