Are mopeds allowed on Northern Ireland motorways?

No. Mopeds are not permitted on Northern Ireland motorways.

The answer depends on the current Northern Ireland road framework, not on forum shorthand or a generic UK summary. Motorways are restricted roads and mopeds fall within prohibited classes because of their limited performance and the risks created by high-speed traffic.

For this exact issue — “Are mopeds allowed on Northern Ireland motorways?” — the Northern Ireland motorway rule has to be applied with high-speed safety in mind. Check the live signs, lane status and whether you are dealing with normal driving, congestion or a genuine emergency. Hard shoulders, emergency areas and motorway lanes are controlled spaces, so actions that would be ordinary on a local road can be prohibited or extremely dangerous here.

Use an alternative A-road or other lawful route and do not enter a motorway even for a short section. If there is any genuine ambiguity at the roadside, prioritise safety first and then verify the position using the official Northern Ireland source rather than taking a risk.

Before publishing this answer, the key factual point in “Are mopeds allowed on Northern Ireland motorways?” was checked against current Northern Ireland official guidance. That matters because road rules, licence entitlements and enforcement details can differ from Great Britain and can change over time; the sources attached below are the ones to re-check if the rule is updated.