CMVSS 108, applied through Technical Standards Document No. 108, is the federal standard governing vehicle lamps, reflective devices and associated equipment in Canada, and it sets binding location, photometric and certification rules. Fleets and manufacturers operating in Canada must confirm three things before a vehicle or retrofit goes into service: TSD 108 conformity, current test records from the OEM or importer, and correct daytime running lamp switching behaviour.
TL;DR:
- Vehicle lamps and reflective devices must meet TSD 108 certification before entering service in Canada, and retrofit lamps must match the original certified configuration.
- Lamp location, mounting height, and spacing are strictly specified in Transport Canada’s detailed tables, with photometric certification required for angled or non-standard installs.
- Trailers wider than 2032 millimeters or over certain weight thresholds require conspicuity tape or reflex reflectors, with placement rules varying by zone and vehicle size.
- Daytime running lamps are mandatory, with activation tied to vehicle wiring and specific conditions for tail lamp operation and fog lamp interactions.
- Manufacturers and importers must retain test records proving compliance, particularly for non-perpendicular lamp mounting, to ensure legal and safe fleet operations.
What CMVSS 108 and TSD 108 cover
CMVSS 108 sits within the Motor Vehicle Safety Regulations and covers lamps, reflective devices and associated equipment fitted to vehicles sold or imported into Canada. The technical detail, including photometric performance, mounting geometry and test procedures, lives in TSD 108, which reproduces the American FMVSS 108 text with Canadian adaptations rather than existing as an entirely separate technical document.
The regulations were updated through SOR/2018-43, which aligned Canadian lighting rules with recent FMVSS revisions, permitted certain UN Regulations such as Adaptive Front-lighting Systems as alternatives to conventional headlamps, and clarified daytime running lamp switching provisions. The amendment reflects a deliberate push toward technical alignment with U.S. standards while preserving provisions specific to Canada.
Compliance obligations fall on different parties depending on their role:
- Manufacturers and importers must certify that lighting equipment meets TSD 108 requirements before a vehicle enters the Canadian market.
- Vehicle operators and fleet managers must verify that lamps, locations and switching behaviour match the certified configuration, particularly after a retrofit.
- Upfitters and installers should consult TSD 108 directly, or the manufacturer’s documentation, whenever a lamp is added or repositioned.
Fleet managers rarely need to read the full technical standard, but knowing it exists, and what it governs, is the starting point for any procurement or upfit conversation.
Location and device requirements for trucks, buses and MPVs
Transport Canada publishes detailed tables covering lighting equipment locations for trucks, buses and multipurpose passenger vehicles, specifying lamp type, colour, mounting height range and horizontal position for each required function. Headlamps, tail lamps, stop lamps and turn signals each carry their own height and location bands, and the tables note when a lamp must be paired with another device or spaced a minimum distance from the vehicle’s edge.
A core mounting principle runs through the tables: every lamp, reflex reflector and conspicuity treatment must be permanently attached in the specified location, facing perpendicular or parallel to the vehicle’s centreline, unless the installation has been photometrically certified for a different angle. This matters most for upfit work, where lamps are sometimes mounted on brush guards, headache racks or custom bumpers.
A few practical points help translate the tables into daily decisions:
- If the original mounting location is obstructed by a body modification, an auxiliary device in an alternate compliant location may be required.
- Angled installations are permitted only with photometric certification confirming the lamp still meets visibility specifications at that angle.
- When a vehicle’s configuration falls outside the standard examples in the tables, the safest step is confirmation from the OEM or importer rather than a field judgment call.
Reading the tables directly is worthwhile for anyone specifying a vocational truck body or a significant upfit, since the location bands vary by lamp function and vehicle class rather than following one universal rule.
Trailer lighting and conspicuity requirements
Trailers carry their own set of location and conspicuity obligations under the federal lighting equipment location requirements for trailers. The tables specify mandatory lamp counts, colours, height ranges and the spacing required between clearance and identification lamps, and they set the width and weight thresholds above which conspicuity treatment or reflex reflectors become mandatory rather than optional.
For trailers wider than 2032 millimetres, or meeting certain gross vehicle weight rating thresholds, Transport Canada’s tables require conspicuity tape or reflex reflectors along the rear and sides, in permitted colours matched to their position on the vehicle. Key points for anyone spec’ing a trailer:
- Rear upper body markings and lower or side conspicuity treatments follow separate placement rules, so one continuous strip of tape does not automatically satisfy both.
- Identification lamp spacing is defined precisely, typically as a cluster of three lamps centred at the rear.
- Ordering conspicuity materials to match these placement rules at the build stage avoids a retrofit later.
Getting these details wrong is common on custom or imported trailers, where the original conspicuity layout may not match Canadian placement rules.
Daytime running lamps and switching behaviour
Daytime running lamps are mandatory on vehicles sold in Canada, and their activation timing and deactivation conditions are set out in TSD 108 and the related Canada Gazette amendments, a stricter position than U.S. practice, where DRLs remain optional in some contexts. The rules also address how DRLs interact with fog lamps and with instrument panel illumination.
One detail that catches procurement teams off guard: DRL switching tied to instrument panel illumination means that on some vehicle configurations, tail lamps must activate automatically once the dash lights up, unless the vehicle is designed with an exception. This is easy to miss on a spec sheet that only lists headlamp DRL behaviour.
Before accepting a new vehicle or approving an aftermarket lighting change, fleet and upfit teams should check:
- Whether DRL activation timing matches TSD 108 requirements out of the box.
- Whether tail lamp activation is tied to instrument panel illumination as required for that configuration.
- Whether any aftermarket lighting interferes with the factory DRL or fog lamp switching logic.
Manufacturer and importer certification obligations
Manufacturers and importers are responsible for maintaining test records proving that lighting components meet TSD 108 requirements. These records document the photometric performance of each lamp type against the applicable standard, and they should be available on request when a fleet is procuring new vehicles or approving a significant upfit.
Photometric certification becomes mandatory whenever a lamp is not mounted perpendicular or parallel to the vehicle’s centreline, which covers most custom or angled installations on modified trucks, trailers and specialty vehicles. In practical terms, this means a lab test confirming the lamp still delivers compliant light distribution at its installed angle, not just at the standard factory orientation.
A reasonable audit file should include:
- The TSD 108 clause references the supplier certifies against.
- Photometric test reports for any non-standard lamp angle.
- Written confirmation from the OEM or importer that current production matches the certified configuration.
- Documentation of any deviation, along with the compensating measure used.
Pro Tip: Ask suppliers directly for TSD 108 clause references and the photometry report before purchase. Missing documentation is usually the fastest sign of a non-conforming product.
Practical compliance checklist for fleet managers
A short, repeatable process keeps procurement and retrofit decisions defensible during an audit or roadside inspection.
- Confirm the vehicle or component carries documented TSD 108 conformity.
- Verify that lamp functions and mounting locations match the applicable Transport Canada table for the vehicle class.
- Request OEM or importer test records, including photometric certification for any angled installation.
- Confirm DRL activation timing and tail lamp switching behaviour.
- Check conspicuity tape and reflex reflector placement against trailer width and weight thresholds.
- Log the inspection date, findings and any supplier correspondence for the vehicle file.
When a configuration falls outside what the tables clearly address, escalate to the OEM, importer or a qualified testing lab rather than guessing. Annual review of these records, alongside any pre-purchase inspection, keeps a fleet’s documentation current between vehicle turnovers. Our fleet lighting compliance guide covers procurement-stage questions in more depth, and our troubleshooting guide supports the inspection step for technicians in the field.
How Strobe My Ride supports your compliance sourcing
A Canadian-owned supplier stocks product lines including the SMR Patrol Line, SMR Fleet Line and SMR Signal Line, shipped domestically to fleets across Canada. Rather than leaving procurement teams to interpret Transport Canada’s tables alone, our technical support team provides SKU-specific guidance on certification and legal colour so a purchase decision starts with the right documentation, not a guess.
A few products worth reviewing directly on their product pages:
- The Patrol Link Plug & Play 4 Interior LED Warning Light Kit for interior-mounted warning applications.
- The Patrol Link Plug & Play 4 Exterior LED Warning Light Kit for exterior installations.
- The ZW-GMLCv2 (ZWAGZ), listed with its own SKU-specific specifications.
Certifications and permitted colours vary by SKU and by jurisdiction, so confirm the details listed on each product page, or contact our technical support team, before ordering. Browse the full catalogue to compare product lines against your fleet’s requirements.
Where to verify these requirements directly
For definitive answers, go to the primary documents: Transport Canada’s pages on truck, bus and MPV lighting locations and trailer lighting locations, the Canada Gazette notice for SOR/2018-43, and TSD 108, Revision 8 for the technical tables. For further reading on headlamp lens care, see this partner article on optical protection.
Sources
- Technical Standards Document No. 108 (TSD 108), Revision 8 — Lamps, reflective devices and associated equipment
- Regulations Amending the Motor Vehicle Safety Regulations (Interpretation and Standards 108 and 108.1): SOR/2018-43
FAQ
What does CMVSS stand for?
CMVSS stands for Canadian Motor Vehicle Safety Standards, the federal regulations governing vehicle safety equipment, including lighting, sold or imported into Canada. Lighting requirements specifically fall under CMVSS 108, applied through Technical Standards Document No. 108.
What are the requirements for trailer reflective tape in Canada?
Conspicuity tape or reflex reflectors become mandatory for trailers exceeding a width of 2032 millimetres, or meeting certain gross vehicle weight rating thresholds. Placement rules differ for the rear upper body, rear lower body and sides, so one strip of tape does not automatically satisfy every zone.
What are the DOT lighting requirements for trucks?
In Canada, truck lighting requirements come from CMVSS 108 and TSD 108, not from U.S. Department of Transportation rules, though TSD 108 reproduces FMVSS 108 with Canadian adaptations. Trucks must meet Transport Canada’s location, colour and height requirements for headlamps, tail lamps, stop lamps and turn signals.
What are the requirements for trailer clearance lights?
Trailer clearance lamps must be installed at the height, colour and location specified in Transport Canada’s trailer lighting tables, with identification lamps typically clustered near the rear centre. Spacing and count requirements vary by trailer width, so wider trailers carry additional clearance lamp obligations.
