A suspicious object was discovered at the Broadway roundabout on Thursday morning.
Army bomb squad officers were tasked to the scene and carried out a controlled explosion.
The alert caused major traffic disruption in the area at the time, vehicles were diverted off the motorway at Stockman's Lane offslip as the Westlink was closed in both directions.
Local councillor Tim Attwood said an object that appeared to be a pipe bomb was found on a BT box.
He condemned those behind it for causing "traffic mayhem" as cars were at a standstill.
The SDLP representative explained: "This device has caused traffic mayhem along a major route.
"The people behind this device are reckless.
"While everyone else was going about their normal business, trying to get to work, their contribution and intent was to cause injury and serious disruption."