M4 shut both ways at Swansea after incident between J45 and J46

Wayne's traffic instruments flagged a closure of the M4 in both directions between junction 45 (Ynysforgan) and junction 46 (Llangyfelach) on Friday, listed simply as "Incident" with the road shut. The reporting material available does not describe the current incident directly — both sources on file are historical accounts of previous closures on this same stretch of motorway near Swansea, and neither confirms details of today's event such as cause, casualties, or expected reopening time. What the archive does show is that this particular section of the M4, which runs past Morriston on the eastern approach to Swansea, has a track record of serious disruption. According to [1], a collision closed lane two eastbound between the same two junctions on a Friday morning, shutting the lane for around an hour before it reopened just before midday, with queues stretching back to junction 47 at Penllergaer and average speeds dropping to 20mph, according to AA Traffic Planner data cited in the report. That same account notes a second, unrelated collision on the A470 at Nantgarw on the same morning, underlining that multiple incidents across the south Wales network are not unusual and do not necessarily indicate anything beyond coincidence. A separate account, according to [2], describes a December 2023 crash that blocked the M4 westbound entirely between junction 45 and junction 46, with Traffic Wales confirming police were on scene before all lanes reopened around 40 minutes later. Delays of 30 minutes were reported in both directions as traffic slowed past the scene, with congestion backing up to junction 42 at Earlswood Roundabout, according to Inrix data quoted in that piece. Neither source confirms whether today's closure involves a collision, a breakdown, a fire, or another cause, nor whether anyone has been injured. The historical pattern in [1] and [2] suggests this stretch — which carries heavy commuter and freight traffic around Swansea — is prone to full or partial closures that typically clear within one to two hours, with knock-on congestion lasting longer. But Wayne should treat that only as background, not as confirmation of what's happening today. Given the lack of confirmed detail on the live incident, this is reported here as a developing road closure rather than a fully established news event. The estate's own feed is the only source currently indicating the road is shut in both directions; nothing in the numbered material corroborates cause, scale, or casualties for today's specific closure. What to watch next: confirmation from Traffic Wales or a live news update on the cause of today's closure, whether it is one-lane or full closure, and when both directions are expected to reopen.