Is parking within 15 metres of a junction prohibited in Northern Ireland?

Generally no. Northern Ireland Highway Code rule 240 states that drivers must not stop or park within 15 metres of a junction, subject to specified exceptions.

The rule provides exceptions for a lay-by in particular circumstances and designated parking areas. Parking close to the corner reduces the view for pedestrians, cyclists and motorists emerging from the side road. Measure from the junction rather than assuming that an absence of yellow lines makes the space suitable. A marked lawful parking bay may be treated differently, but blocking visibility at a junction remains dangerous.