Technical Amendments to TDGR

Summary#

This is a final set of technical fixes to the Transportation of Dangerous Goods Regulations (TDGR) published by Transport Canada. The amendments — a package of 117 mostly editorial and clarification changes — came into force on July 5, 2023 and tidy wording, fix bilingual discrepancies, update references and modernize certain terms used in the rules.

What it does#

• Removes a few obsolete or transitional provisions that no longer apply.
• Fixes wording, spelling, punctuation and formatting errors across the TDGR.
• Brings TDGR language into line with the Transportation of Dangerous Goods Act, 1992 and international UN recommendations (for example, replacing some old terms and harmonizing English and French text).
• Repeals or updates a number of definitions and replaces outdated terms (for example, some “safety mark” and “permit” terms were replaced with modern equivalents).
• Updates cross‑references to other regulations and standards, including replacing older references with the Packaging and Transport of Nuclear Substances Regulations, 2015 and adding the Canada Consumer Product Safety Act where needed.
• Clarifies how limited‑quantity marks and some labels should look and be sized (for example, a square‑on‑point line width and minimum sizes are specified in the amendments).
• Corrects entries and notes in the TDGR schedules (UN numbers, shipping names, special provisions and legends), and standardizes some chemical and shipping names.
• Confirms these changes are administrative and technical in nature and are not intended to change the safety intent or impose new costs.

Who's affected#

• Businesses and people who import, offer for transport, handle or transport dangerous goods — including shippers, carriers and consignors.
• Manufacturers and maintainers of means of containment (packaging, cylinders, tanks) and those who mark or label them.
• Organizations that apply for or use equivalency certificates under the TDGR.
• Regulators and inspectors, including Transport Canada, who apply and enforce the rules.
• It is not always possible to list every affected subgroup; many changes are wording or bilingual corrections that mainly affect legal clarity rather than day‑to‑day activity.

Why it matters#

• Clearer wording and consistent bilingual text reduce confusion for people who must comply with the rules.
• Harmonizing terminology with the Act and international standards makes it easier for businesses and regulators to interpret requirements the same way.
• The changes are intended to improve readability and reduce contradictions without creating new obligations or costs.
• If you work with dangerous goods, you should review the updated TDGR to note any wording or reference changes that affect your paperwork, labels, or applications for certificates.