The following comes from Regulation 32 of the Road Vehicles Construction and Use Regulations 1986 as amended up to 2008
<B style="mso-bidi-font-weight: normal">(10) Save as provided in paragraph (11), the windscreens or other windows constructed in accordance with the foregoing provisions of this regulation of specified safety glass, specified safety glass (1980) or safety glazing and specified in column 3 of Table II in relation to a vehicle of a class specified in column 2 of that Table shall have a visual transmission for light of not less than the percentage specified in relation to those windows in column 4 when measured perpendicular to the surface in accordance with the procedure specified in a document specified in relation to those windows in column 5. <?: prefix = o ns = "urn:schemas-microsoft-com

ffice

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TABLE II
(regulation 32(10))
<TABLE =MsonormalTable style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-table-layout-alt: fixed; mso-border-alt: solid text .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-insideh: .5pt solid text; mso-border-insidev: .5pt solid text" cellSpacing=0 cellPadding=0 border=1>
<TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes">
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: text 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: text 1pt solid; WIDTH: 23.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt" vAlign=top width=31>
1
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: text 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 114pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt" vAlign=top width=152>
2
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: text 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 96pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt" vAlign=top width=128>
3
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: text 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 36pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt" vAlign=top width=48>
4
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: text 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 223.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt" vAlign=top width=298>
5
<TR style="mso-yfti-irow: 1">
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: text 1pt solid; WIDTH: 23.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=31>
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 114pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=152>
Class of Vehicles
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 96pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=128>
Windows
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 36pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=48>
%
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 223.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=298>
Documents specifying procedure
<TR style="mso-yfti-irow: 2">
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: text 1pt solid; WIDTH: 23.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=31>
1
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 114pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=152>
Motor vehicles first used before1st April 1985
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 96pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=128>
All windows
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 36pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=48>
70
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 223.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=298>
British Standard specification No 857 or No. 5282
<TR style="mso-yfti-irow: 3; mso-yfti-lastrow: yes">
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: text 1pt solid; WIDTH: 23.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=31>
2
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 114pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=152>
Motor vehicles first used on or after 1st April 1985 and trailers
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 96pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=128>
(a) Windscreens
(b) All other windows
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 36pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=48>
75
70
<TD style="BORDER-RIGHT: text 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 223.3pt; PADDING-TOP: 0cm; BORDER-BOTTOM: text 1pt solid; : transparent; mso-border-alt: solid text .5pt; mso-border-left-alt: solid text .5pt; mso-border-top-alt: solid text .5pt" vAlign=top width=298>
The documents mentioned in sub-paragraph (i), (ii) or (iii) of the definition in paragraph (13) of “specified safety glass (1980).�
(11) Paragraph (10) does not apply to-
(a) any part of any windscreen which is outside the vision reference zone;
(b) windows through which the driver when in the driver's seat is unable at any time to see any part of the road on which the vehicle is waiting or proceeding;
(c) windows in any motor ambulance which are not wholly or partly in front of or on either side of any part of the driver's seat; or
(d) windows in any bus, goods vehicle, locomotive, or motor tractor other than windows which-
(i) are wholly or partly in front of or on either side of any part of the driver's seat;
(ii) face the rear of the vehicle; or
(iii)form the whole or part of a door giving access to or from the exterior of the vehicle.
<B style="mso-bidi-font-weight: normal">(11A) Paragraphs (10) and (11) have effect in relation to any tint, film or other substance or material applied to a windscreen or window as they have effect in relation to the windscreen or window itself
The following is from the Road Traffic Offenders Act 1988
Level 3 is £1,000 &
Level 4 is £2,500
<TABLE =MsonormalTable style="WIDTH: 100%; mso-cellspacing: 1.5pt" cellPadding=0 width="100%" border=1>
<TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-yfti-lastrow: yes; page-break-inside: avoid">
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; : aqua; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 56.35pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8" vAlign=top width=75>
<B style="mso-bidi-font-weight: normal">section 42[/B]<B style="mso-bidi-font-weight: normal">[/B]
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 149.9pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=200>
<B style="mso-bidi-font-weight: normal">Breach of other construction and use requirements[/B].
<B style="mso-bidi-font-weight: normal">other than one within section 41A(a) or 41B(1)(a) or 41D[/B]<B style="mso-bidi-font-weight: normal">[/B]
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 79.5pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=106>
Summarily
Prosecution.
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 160.5pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=214>
(a) Level 4 on the standard scale if committed in respect of a goods vehicle or a vehicle adapted to carry more than eight passengers.
(b) <B style="mso-bidi-font-weight: normal">Level 3 on the standard scale in any other case[/B]
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 115.5pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=154>
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 79.5pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=106>
<TD style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 0.75pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; BORDER-LEFT: #d4d0c8; WIDTH: 81.25pt; PADDING-TOP: 0.75pt; BORDER-BOTTOM: #d4d0c8; : transparent" vAlign=top width=108>
[/B]
Please excuse some of the above
People taking liberties with both their own and other peoples safety and a lack of consistent Traffic Law enforcement are two of my major concerns over the roads network nowadays