What do hatched road markings bordered by solid white lines mean in Northern Ireland?

Hatched markings bordered by a solid white line should not be entered except in an emergency or where legally permitted by a specific exception.

The solid boundary is what makes the restriction stronger than ordinary hatched areas bordered by broken lines.

Northern Ireland's Highway Code uses signs, signals and road markings together, so the safest reading is always the exact sign at the location plus any lane arrows, plates or temporary traffic management. Rules expressed as ‘must’ or ‘must not’ are legal requirements; advisory wording can still be used as evidence when responsibility for a collision is considered.

For this exact question — “What do hatched road markings bordered by solid white lines mean in Northern Ireland?” — the practical point is: Plan lane position early and avoid crossing the solid edge merely to overtake or shorten a route. The answer should be applied to the actual signs, conditions, licence wording or parking rules in force at the time, because temporary restrictions and individual DVA decisions can change the ordinary position.