The A519 is a new-build distributor through western Lisburn that bypasses the A30 and B101 through Ballymacash.
The road starts at a gyratory on the A3 on the western side of Lisburn city centre. It heads north along Thiepval Road over the Belfast to Dublin railway line before descending to a roundabout providing access to Tesco. The road continues ahead along Prince William Road which runs between the suburbs, although side roads, some of which need traffic lights, provide access to these.
After bending round to the right the A520 comes in from the left at traffic lights after which we head north and cross the A30. Then, after a final set of traffic lights we reach a roundabout where the A519 ends. Right is the A513; ahead, the B101.