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BS AU 145e:2018:2021 Edition

BS AU 145e:2018:2021 Edition

$142.49

Specification for retroreflecting number plates

Published By Publication Date Number of Pages
BSI 2021 32
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This British Standard specifies requirements for retroreflecting number plates for vehicles, including requirements for:

  1. colorimetric and photometric properties;

  2. adequate contrast between background and characters in NIR wavelengths to demonstrate compatibility with automatic number plate recognition (ANPR) systems; and

  3. resistance to bending, impact, abrasion, corrosion, solvents, weathering and extremes of temperature.

The British Standard does not specify requirements for number plates fitting, which is prescribed by statutory regulations.

NOTE 1 The appropriate regulations of The Road Vehicles (Display of Registration Marks) Regulations 2001 (as amended) [1] specify requirements for fixing, size and type of letters, numbers and spacings of retroreflecting number plates.

NOTE 2 Retroreflecting number plates can be manufactured from any material which performs satisfactorily in service, providing the requirements of this British Standard are met.

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
9 4 Marking and design
4.1 Marking
4.2 Design
4.3 Fixing instructions
5 Performance of background and characters
5.1 Background
5.2 Characters
10 5.3 Contrast in NIR between characters and background
6 Testing
Table 1 — Test schedules
11 Figure 1 — Dimensions and layout of sample unit required for testing
7 Colorimetry
Table 2 — Daylight chromaticity and luminance factor limits
12 8 Visible light retroreflection
Table 3 — Minimum coefficient of retroreflection, RA, of the retroreflective background
13 Figure 2 — Arrangement of apparatus for measuring the coefficient of retroreflection
9 Resistance to bending
14 Figure 3 — Number plate bend test arrangement
10 Resistance to solvents
15 11 Thermal resistance
12 Resistance to impact
13 Resistance to abrasion
14 Resistance to corrosion
16 15 Resistance to weathering
15.1 General
15.2 Visual appearance
15.3 Colour fastness
15.4 Coefficient of retroreflection
15.5 Effect of dirt
17 Figure 4 — Test arrangements for measurement of the coefficient of retroreflection of wet specimens
18 Annex A (informative)  Adhesive attachment of number plates
20 Annex B (informative)  Guidance for drilling through number plates
21 Annex C Determining effective contrast in the infrared spectrum between characters and retroreflective background
23 Figure C.1 — Infrared image of plate sample and resultant contrast histogram
Table C.1 — Tabulation of test reports
24 Annex D Method of test for impact resistance
Figure D.1 — Apparatus for impact resistance test
25 Figure D.2 — Number plate holding fixture
27 Annex E Method of test for thermal resistance
Figure E.1 — Sample support stand for thermal resistance test
28 Annex F Method and apparatus for accelerated artificial weathering tests
Table F.1 — Temperature
29 Annex G Procedure for preparing a dirty number plate for test purposes
30 Bibliography

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BS AU 145e:2018
$142.49