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.

In order to operate radio-controlled equipment, e.g. toll recording systems, areas 1 on the windshield are permeable to radio waves. 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.
See also:
Safety & Reliability
As of this writing, the Insurance Institute for Highway Safety had not yet
crash-tested the GL-Class. The nine standard airbags include three-row side
curtain airbags, a driver's knee airbag and s ...
Roof carrier
Important safety notes
WARNING
Only use roof racks approved by Mercedes-
Benz for your vehicle model to avoid damage
to the vehicle.
Follow the manufacturer's installation
instructions. O ...
Towing a vehicle with both axles on the ground
When having your vehicle towed, observe the important safety notes ().
WARNING
The power assistance for the steering and the brake force booster do not work
when the engine is not running. Yo ...
