Editing Windshield (section)

==Other aspects==
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In many places, laws restrict the use of heavily [[Window tinting|tinted glass]] in vehicle windshields; generally, laws specify the maximum level of tint permitted. Some vehicles have noticeably more tint in the uppermost part of the windshield to block [[light pollution#Glare|sunglare]].

In aircraft windshields, an electric current is applied through a conducting layer of [[tin dioxide|tin(IV) oxide]] to generate [[heat]] to prevent [[frost|icing]]. A similar system for automobile windshields, introduced on [[Ford Motor Company|Ford]] vehicles as "[[Quickclear]]" in Europe ("InstaClear" in North America) in the 1980s and through the early 1990s, used this conductive metallic coating applied to the inboard side of the outer layer of glass. Other glass manufacturers utilize a grid of micro-thin wires to conduct the heat especially on the later European Ford Transit vans. These systems are more typically utilized by European auto manufacturers such as [[Jaguar Cars|Jaguar]] and [[Porsche]].

The use of thermal glass prevents some [[Automotive navigation system|navigation systems]] from functioning correctly, as the embedded metal blocks the satellite signal. The RF signal tends to flow along the metal wires or layer so very little radiation can pass. This can be resolved by using an external antenna. Mobile telephones can also have problems; thermal glass typically allows only 0.001 (1‰, or one per mille) of the signal to pass, whereas a concrete wall with rebars allows up to 0.100 (10%, or 100‰) of the signal to pass.