Three numbers often appear in specifications for conspicuity marking: R150, R104 and R48. They belong to the same subject, but they answer different questions. Keeping those questions separate prevents an approved product from being installed incorrectly.
R150 concerns product type approval
UN Regulation No. 150 covers the approval of retro-reflective devices and marking materials. For conspicuity contour and line marking, Class C is the relevant material class. The regulation includes photometric, colour, durability and marking requirements.
Approval under R150 therefore says something about the tested product type. It does not decide which pattern a specific truck or trailer needs.
R48 concerns installation on the vehicle
UN Regulation No. 48 governs installation of lighting and light-signalling devices, including conspicuity marking. It covers applicability by vehicle category and dimensions as well as colour, position, coverage and the choice between line, partial contour and full contour marking.
An approved Class C roll can still produce a non-compliant vehicle if the wrong colour or layout is used.
Why R104 still appears
R104 was the separate regulation for retro-reflective markings on heavy and long vehicles. Its product requirements were brought into R150. Older vehicles, documents and stock may therefore still show an R104 approval.
Do not assume that every older approval is invalid. Check the full approval marking, the applicable series and transition provisions. Ask the manufacturer for the approval document when identification is unclear.
Practical rule: R150 checks the material, R48 controls installation and the national inspection system assesses the vehicle in service.
A reliable workflow
- Record category, maximum mass, dimensions and country of registration.
- Determine the required marking pattern from the applicable installation rules.
- Select the approved class, colour and product variant.
- Install according to both R48 and the manufacturer's instructions.
- Keep the data sheet, approval reference, batch and final photographs in the vehicle file.
This separation also makes purchasing and workshop orders clearer: one section specifies the product, another specifies how it must be installed.
Use the distinction in daily work
Put the applicable product regulation and installation regulation in separate fields on purchase orders and workshop instructions. Add the source version and review date. This makes a later repair traceable and prevents a marketing description from being treated as a technical specification.
Official sources
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Frequently asked
No. Older approvals and transition provisions can remain relevant. Check the complete approval documentation for the product and vehicle.
No. The class must be correct, but colour, position, pattern, attachment and vehicle application must also comply.