Lighting: what a US car really has to change, and what it does not

Update — 2026-09-21. Added the national section. Germany forbids the red rear indicator by statute (§ 54(3) StVZO) while the Dutch APK colour rule tolerates it — with the warning that the APK is the periodic test for an already-registered car and not first admission. Also corrected two widely-repeated misquotations: a TÜV Rheinland release about import retrofits names reversing lamps and unapproved headlamps, not rear fog lamps, and the DEKRA and RDW sentences about replacing headlamps are scoped to right-hand-drive vehicles rather than US cars.

Lighting is the biggest single conversion job on a US import and the one where the most money gets spent on things that were never required. This is what the regulations actually say, read from the texts rather than from what a shop told somebody.

The four real problems

1. Rear turn signals must be amber, and cannot share a lamp with the brake light

UN R48 paragraph 5.15 lists the colour of every lamp, and for the direction indicator it says one word: Amber. No front/rear distinction, no exception. The device regulation R6 paragraph 8 says the same.

US law explicitly allows red: FMVSS 108 Table I-a requires "2 Amber or red" at the rear. That is why so many US cars have a red lamp doing both jobs.

And there is a second rule that kills the combined lamp even if you could change its colour — R48 paragraph 5.7.1.2:

**Stop lamps and direction-indicator lamps are not permitted to be reciprocally

incorporated.**

So a single bulb or a single chamber doing brake and indicator is out, regardless of colour. Where they are merely grouped in one housing, 5.7.1.3 requires that their apparent surfaces do not overlap.

2. There is no rear fog lamp, and one is mandatory

R48 6.11.1: "Devices of F or F1 or F2 categories: Mandatory." FMVSS 108's required-lamp table has no rear fog lamp in it at all, so a US car simply does not have one.

One is enough. R48 6.11.2: "One or two." If you fit one, 6.11.4.1 puts it on the opposite side of the centreline to the direction of traffic — so in right-hand-traffic countries, the left side, or on the centreline itself.

The rest of the specification, so you can check a part before you buy it:

That 100 mm separation from the stop lamp is the one that catches retrofits — it rules out the obvious spot next to the brake light on a lot of cars.

3. Side direction indicators — usually missing entirely

R48 6.5.3, Arrangement A, applies to all motor vehicles: two front, two rear, and two side direction indicators of category 5 on all M1 vehicles.

FMVSS 108 has no side turn signal requirement at all. This is the item most often forgotten in a quote, because the amber side markers a US car does have look like they might count. They do not — a marker lamp and a direction indicator are different devices under different regulations.

R48 6.18.7 does allow amber side-marker lamps on an M1 under 6 m to be wired to flash in phase with the indicators on that side, which is a legitimate route on some cars.

4. The headlamp beam

Two separate failures.

The approval. R48 6.2.2: dipped-beam headlamps must be "type approved according to Regulations Nos 98 or 112". A SAE/FMVSS 108 headlamp holds no such approval, so it fails before anybody measures anything.

The beam itself. R112 6.2.1 requires an asymmetric cut-off, verbatim:

For right hand traffic beams: (i) a straight "horizontal part" towards the left;

(ii) a raised "elbow – shoulder" part towards the right … the "elbow-shoulder" part shall

have a sharp edge.

Aimed, per 6.2.2.1, with the horizontal part 1% (0.57°) below the H-H line, and glare limited at point B 50 L to 350 cd maximum (6.2.4).

The US standard defines a cutoff too — but a different thing. FMVSS 108 calls it a "visual/ optical aiming cue" that "may be either on the left side or the right side of the optical axis" (S10.18.9.1), aimed at 0.4° down on the left or at the H-H line on the right (S10.18.9.1.1), with lenses marked VOL or VOR. Under FMVSS it is an aiming aid that can sit at the horizon. Under R112 it is a photometric feature that must be below it with a sharp raised elbow toward the kerb.

Two more installation rules people miss: R48 6.2.6.1.2 sets the initial downward aim at −1.0% to −1.5% for a lamp mounted below 1.0 m, and R48 6.2.9 requires headlamp cleaning devices where the dipped beam exceeds 2 000 lumens — which is most HID and many LED units.

The three things that are NOT problems, whatever anyone tells you

Daytime running lamps are not required on the harmonised route

This is the most commonly mis-stated item in the whole subject, and the answer is in the Regulation rather than in the folklore.

Regulation (EU) 2018/858, Annex II Appendix 2, item 20A(a), verbatim:

The lighting installation shall meet the requirements of UN Regulation No 48, **series of

amendments 03**, with the exception of the requirements of Annexes 5 and 6 to that

Regulation.

And in the 03 series, paragraph 6.19.1 reads: "Daytime running lamp — Presence: Optional on motor vehicles." (It became "Mandatory" only in the 04 series.)

So EU individual approval binds to the version in which DRLs are optional. The DRL is the one item on this page that the older baseline relaxes — we checked the same 03-series text and it still mandates the rear fog lamp, still requires amber indicators, and still carries the amber/red side-marker rule.

For completeness: the EU obligation to fit DRLs came from Commission Directive 2008/89/EC Article 2, and it bites on new vehicle types approved from 7 February 2011 — not on vehicles already built. Nothing in it requires retrofitting an older car.

(If you do fit them anyway, R87 wants white, 400–1 200 cd, 25–200 cm² of apparent surface. Note that a US DRL is allowed up to 3 000 cd under FMVSS 108 S7.10.13 — two and a half times the EU ceiling — so a US-spec DRL is not automatically an R87 one.)

Your existing lamps do not need an E mark

Appendix 2 switches the device regulations off for what is already on the car. Item 22A, covering position, stop, side-marker and daytime running lamps:

The requirements set out in the UN Regulations No 7, No 87 and No 91 **shall not apply.

However, the correct functioning of the lights shall be checked by the technical service.**

The same sentence appears at item 23A for direction indicators (R6), 24A for the rear plate lamp (R4), 26A front fog, 28A rear fog, 29A reversing and 30A parking lamps.

What is required is item 20A(c):

Lights and signalling devices that, for the purpose of fulfilling the requirements of point

(a) must be retrofitted, shall bear an "EU" type-approval mark.

So the line is: lamps already on the car need to work and to satisfy R48's rules on number, design, wiring and colour. Lamps you add — the rear fog, amber rear indicators, side repeaters, any extra rear retro-reflectors under item 21A — must carry an approval mark.

That single distinction is worth more than anything else on this page, because it is the difference between replacing a tail light cluster and adjusting one.

The headlamps are the exception: items 25C/25E/25F require the passing beam to be measured against R112 paragraph 6 whichever regulation the lamp was approved under. And 20A(e) requires the dipped beam to be "adapted to the direction of traffic legally in force in the country where the vehicle is granted approval".

Red rear side markers can be legal

R48 5.15, verbatim:

Side-marker lamp: Amber; however the rearmost side-marker lamp can be red if it is

grouped or combined or reciprocally incorporated with the rear position lamp, the rear

end-outline marker lamp, the rear fog lamp, the stop lamp, or is grouped with or has part of

the light emitting surface in common with the rear retro-reflector.

A US car's amber front markers are fine as they are. The red rear ones are legal if that rearmost lamp is grouped with one of the devices named above — which, on many cars, it already is because it sits in the tail light cluster. A standalone red marker on the quarter panel, grouped with nothing, does not meet the condition.

And side markers are usually optional anyway: R48 6.18.1 makes them mandatory over 6 m in length, and on a shorter M1 only where they supplement reduced geometric visibility of the position lamps.

The mandatory list for a passenger car

From R48 Section 6, where each device's paragraph 6.x.1 states Mandatory, Optional or Prohibited:

Mandatory on an M1: main beam, dipped beam, reversing lamp, direction indicators (two front, two rear, two side), hazard warning, stop lamps (two plus a centre high-mounted one), rear registration plate lamp, front position lamps, rear position lamps, rear fog lamp, rear non-triangular retro-reflectors, and — in the current 06 series, though not in the 03 series that individual approval uses — daytime running lamps.

Prohibited on an M1: triangular rear retro-reflectors (6.15.1 — those are for trailers), and conspicuity markings under R104 (6.21.1.1).

Conditionally mandatory: end-outline marker lamps above 2.10 m width; side retro-reflectors above 6 m; side-marker lamps as described above.

The checklist, in the order that costs least

1. Check the emissions label and the headlamp markings first, before buying anything. A car with a European-market lamp assembly available off the shelf is a different job from one without.
2. Rear fog lamp — the only genuinely missing mandatory device on most US cars. Fit one, with an approval mark, more than 100 mm from the stop lamp, with its dashboard tell-tale.
3. Side direction indicators — the second missing device. Approval mark required.
4. Rear indicators to amber, and out of the stop lamp. Often the whole tail light cluster; sometimes a European-market cluster bolts straight in.
5. Headlamps — the expensive one. The beam is measured against R112 para 6 regardless of what the lamp is, so this is the item where a European-market assembly usually pays for itself.
6. Do not budget for DRLs on the harmonised route, and check before you budget for E-marking anything that is already on the car.

Two countries, to show that "it depends" is not a cop-out

Article 45 lets each member state write its own alternative requirements, and the difference between two neighbours is bigger than most people expect.

Germany forbids the red rear indicator by statute. § 54(3) StVZO, verbatim:

Als Fahrtrichtungsanzeiger sind nur Blinkleuchten für gelbes Licht zulässig.

(Only amber flashing lamps are permitted as direction indicators.) § 54(4) Nr. 1 requires them in pairs front and rear on a multi-track vehicle. There is no discretion in that sentence.

Germany's rear fog rule, § 53d StVZO, matches UN R48 line for line and is worth reading because it is shorter: a red light; multi-track vehicles with a design speed over 60 km/h "müssen hinten mit einer oder zwei" be equipped; the lowest point of the illuminated surface not less than 250 mm; more than 100 mm from the brake lamp; and where only one is fitted it must be "in der Mitte oder links davon" — in the centre or to the left of it.

On approval, cite two provisions together rather than one. § 49a(1) is a closed-list rule — "An Kraftfahrzeugen und ihren Anhängern dürfen nur die vorgeschriebenen und die für zulässig erklärten lichttechnischen Einrichtungen angebracht sein" — meaning only prescribed and permitted devices may be fitted at all. The requirement that the lamps themselves be type-approved is § 22a(1), whose list includes headlamps, tail lamps, stop lamps, retro-reflectors, Nebelschlussleuchten (Nr. 16a) and Fahrtrichtungsanzeiger (Nr. 17).

A small thing that is quietly reassuring: § 49a StVZO cites UN R48 by the identical Official Journal reference — L 14, 16.1.2019, p. 42 — that Regulation (EU) 2019/2144 Annex II names and that this guide reads from. German statute, EU regulation and our source are the same document.

The Netherlands tolerates the red rear indicator at periodic inspection. RDW's APK handbook, art. 5.2.53 §2:

De richtingaanwijzers en waarschuwingsknipperlichten mogen naar voren niet anders dan

ambergeel of wit en naar achteren niet anders dan ambergeel of rood stralen.

(Indicators and hazard lights may show, to the front, only amber or white, and to the rear only amber or red.)

Do not read that as permission to import a car with red rear indicators into the Netherlands. The APK is the periodic roadworthiness test for a car that is already registered. First admission runs through UN R48 and Appendix 2 item 20A(b), which allows no exemption on "the colour of light emitted". A car can therefore pass a Dutch APK with red rear indicators without ever having been admitted with them. Conflating the two regimes is exactly how somebody's car gets refused.

The Dutch mandatory-lamp list (art. 5.2.51) also carries a date threshold worth knowing: two front and two rear indicators, "één zijrichtingaanwijzer aan elke zijkant", one rear fog lamp "in of links van het middenlangsvlak" and a reversing lamp are each required only "indien het voertuig na 31 december 1997 in gebruik is genomen". For a pre-1998 import that changes the answer.

RDW's own import page is blunt about the route — "Wij moeten elk voertuig zonder typegoedkeuring per stuk goedkeuren" — and names the two failures we listed above as the common ones: "Mistachterlichten en zijrichtingaanwijzers: ontbreken vaak. Nieuw te plaatsen mistachterlichten en zijrichtingaanwijzers moeten een Europese typegoedkeuring hebben." Which is item 20A(c) again, in Dutch.

What we did not verify

UNECE's own server refuses automated access, so every UN Regulation above was read from its publication in the Official Journal — which is the better source for this purpose anyway, because Regulation (EU) 2019/2144 Annex II identifies the applicable version of each UN Regulation by its exact OJ citation, and those are the citations we read.

The latest UNECE consolidated revision of R48 is newer than the 06 series bound by EU law; we did not read it, and nothing here depends on a post-06-series amendment. We also did not read R98 or R123 directly — they appear only as alternatives via R48 and Appendix 2 — and we are not quoting numeric US lower-beam photometric limits, because those tables did not render in the official CFR text we could retrieve.

Only Germany and the Netherlands are covered nationally above. TÜV SÜD's site refuses automated access, and Romania's authority was unreachable from here, so neither is quoted. Everything else is the EU-level answer, and your country's inspector works from a national list that belongs in its own country playbook.

One caution about second-hand quotations, because we hit it: a TÜV Rheinland release about import approvals names reversing lamps and unapproved headlamps as the common retrofits — not rear fog lamps, which several sites attribute to it. And DEKRA's and RDW's sentences about headlamps needing to change are scoped to right-hand-drive vehicles from the UK and Japan; they do not describe a US car, whatever a search result implies. If a claim about your car comes from a summary rather than from the page, open the page.

Sources

• UN Regulation No 48 (installation of lighting), 06 series — OJ L 14, 16.1.2019, p. 42 (official · 2026-09-21)
• UN Regulation No 112 (asymmetrical passing beam) — OJ L 250, 22.8.2014, p. 67 (official · 2026-09-21)
• UN Regulation No 38 (rear fog lamps) — OJ L 148, 12.6.2010, p. 55 (official · 2026-09-21)
• UN Regulation No 48, 03 series — OJ L 137, 30.5.2007 (the version EU individual approval binds to) (official · 2026-09-21)
• Regulation (EU) 2018/858 — Annex II Appendix 2, items 20A–30A (official · 2026-09-21)
• 49 CFR 571.108 (FMVSS 108) — US lamp requirements (official · 2026-09-21)
• § 54 StVZO — Fahrtrichtungsanzeiger (Germany: indicators, amber only) (official · 2026-09-21)
• § 53d StVZO — Nebelschlussleuchten (Germany: rear fog lamps) (official · 2026-09-21)
• RDW APK Handbook art. 5.2.53 (Netherlands: colour of lights at periodic inspection) (official · 2026-09-21)

Verified 2026-09-21. Rates, fees and legal requirements change. Check the sources before acting on a number here.