A serious crash on the M4 eastbound in Swansea has led to significant traffic disruptions during the evening rush hour. The incident resulted in the closure of the motorway between junctions 47 (Penllergaer) and 46 (Llangyfelach), causing long delays for motorists. Traffic Wales confirmed that the road was shut to allow emergency services to respond to the situation. Drivers were advised to exit the M4 at junction 47 and use the A48 as an alternative route. As the evening progressed, traffic conditions began to improve. By 19:25, reports indicated that traffic had returned to normal following the earlier chaos. However, prior to this, delays had reached up to 102 minutes, with congestion stretching for 12 miles. At 18:38, traffic was reported to be easing, but motorists still faced delays of approximately 30 minutes. The AA's traffic monitor had warned of delays of 45 minutes earlier in the evening. Inrix, a traffic monitoring service, noted that all traffic was temporarily held due to the accident, with severe delays reported from junction 47 to junction 46. Emergency services were on the scene, and a spokesperson for Traffic Wales stated, "Warning. M4 eastbound J47 Penllergaer - J46 Llangyfelach. Reports of collision in the area. Emergency services at scene. Traffic officers en route." As the situation unfolded, traffic cameras showed severe congestion, with many drivers stuck in standstill traffic. The diversion route via the A48 also experienced heavy delays as drivers attempted to navigate around the closure. By 20:02, traffic conditions had improved significantly, with delays reduced to around 10 minutes. Despite the reopening of the motorway, some residual congestion remained in the area. Motorists are reminded to stay updated on traffic conditions and to plan their journeys accordingly as the aftermath of the crash continues to affect travel times.