The Supreme Court has recently (27-4-2012) passed an order on use of 
films on vehicle windscreens and windows. Different papers have reported
 it differently, police all over the country are taking action and MGP 
has received numerous queries on the exact meaning of the judgment. The 
order passed by a three-man bench consisting of Chief Justice S.H. 
Kapadia and Justices A.K. Patnaik and Swatanter Kumar is available here.
 A careful reading of the text reveals ambiguities which we were not 
able to resolve. We will first give what the law says and then list some
 of the unresolved ambiguities and inconsistencies in the judgment. 
 
Sec. 100 of the Motor Vehicles Rules, 1989 (MVR) is the law 
which deals with vehicle windscreens and windows. According to it, the 
glass of windscreens and the windows of every motor vehicle should be 
made of safety glass. The glass of the windscreen and rear window should
 have a VLT (visible light transmittance) of 70% or more and the VLT of 
the side windows should be 50% or more. VLT is just a technical name for
 transparency and so a black glass which does not allow any light to 
pass has 0 % VLT and a perfectly transparent glass has 100% VLT. It is 
significant that the law is silent on films applied to car windows.
 
 The judgment interprets the 70% and 50% VLT levels specified in 
the law to refer to the  time of manufacture of the safety glasses and 
hence prohibits application of any film to the glasses. This 
interpretation is contrary to that given in other countries. For 
example, Sec. 100 of the MVR is very similar to the applicable law in 
the UK (Regulations 31 and 32 of the The Road Vehicles (Construction and
 Use) Regulations 1986) which prescribes VLT limits of 75% and 70%. 
Neither the Indian law nor the UK law mentions films, but the UK law is 
interpreted to permit films on glasses as long as the VLT limits are 
satisfied. Higher courts in India generally refer to interpretations of 
similar laws in other countries, especially UK, but it has not been done
 here. It would have been nice if the Supreme Court had considered the 
interpretation of the UK law and explained why it may not be applicable.
 
Now some of the ambiguities, inaccuracies, inconsistencies and 
typos which detract from the solemnity of the Supreme Court judgment.
 
The judgment prohibits the use of "black films of any VLT 
percentage". Black films have a VLT of 0% and if the VLT is neither 0% 
or 100%, the film is grey and not black. So the words "black films of 
any VLT percentage" used throughout the judgment is confusing.
 
Para 3 of the judgment says "The glasses of the vehicles 
having a coating of black films cannot be termed as 'tinted glasses'". 
The Court seems to be under the mistaken impression that Sec. 100 of the
 MVR permits tinted glasses on automobiles. But Sec. 100 of the MVR 
speaks only of the VLT of the windows, but does not refer to "tinted 
glasses".
 
Para 8 of the judgment says that black film on vehicle glasses
 is banned in Afghanistan, Belarus, Nigeria, Uganda and Pakistan. It 
also says that use of black films is not prevalent in United States of 
America, United Kingdom, Germany and other countries as well. But this 
is not true. Window films are allowed in the USA, UK and Germany. In 
fact, all the European countries allow films on vehicle glasses, but 
some countries such as France and Spain do not permit it on the 
windshield.
 
One of the reasons put forth in the judgment to extend Sec. 100
 of the MVR to completely prohibit film on car windows is the fact that 
luxmeters (instruments which measure VLT of glass) are a "scarce" 
resource and "is very scantily available with the police personnel in 
India".  But luxmeters are quite cheap (Rs. 2000-2500 per unit and 
probably cheaper if purchased in bulk) and there is no reason the police can not afford them. Also, lack of equipment can not be a reason for reinterpreting the law.
 
In Para 18, the judgment says "Another adverse aspect of use 
of black films is that even if they reflect tolerable VLT in the day 
time, still in the night it would clearly violate the prescribed VLT 
limits and would result in poor visibility, which again would be 
impermissible." Since VLT is just another name for transparency, it can 
not change from daytime to nighttime. Further, "reflecting tolerable 
VLT" is difficult to understand. This para is quite confusing.
 
Para 27 of the judgment prohibits the use of black films of any
 VLT percentage or any other material upon vehicle glasses, but, the 
next para omits the words "or any other material". It is not known if 
the omission is intentional and not a typographical error.
 
 Para 19 of the judgment speaks of police authorities from the 
"states of Calcutta, Tamil Nadu and Delhi". It should have been West 
Bengal and not Calcutta.
 
A review petition to the Supreme Court may clear up these 
anomalies in the present judgment and give a clearer interpretation of 
the law about the use of films on car windows.
Dwarkanath Narayan, Mysore Grahakara Parishat