Key Points
- South Wales Police are dealing with a serious road traffic collision at the busy intersection of Romilly Road, Llandaff Road and Romilly Crescent in Cardiff.
- The incident has caused significant traffic congestion in the surrounding area, with long delays reported on key routes into the city.
- Motorists are advised to avoid the area and use alternative routes while emergency services attend the scene.
- Further delays are affecting the A470 southbound from Nantgarw to Coryton, adding pressure to commuter routes into Cardiff.
- Additional congestion reported on the M4 and A4232 near Cardiff amid wet weather conditions.
Cardiff (The Wales Times) January 13, 2026 – A serious road traffic collision at a major junction in west Cardiff has triggered long delays on key routes into the city centre this morning.
Emergency services rushed to the intersection of Romilly Road, Llandaff Road and Romilly Crescent following reports of the incident. South Wales Police confirmed they are on scene managing the serious collision, which has led to significant traffic build-up across the local network. Drivers are facing extended journey times as queues stretch back through Llandaff and into surrounding roads.
What Caused the Delays on Cardiff’s Major Routes?
South Wales Police stated they are currently dealing with a serious road traffic collision in Cardiff at the busy junction where Romilly Road meets Llandaff Road and Romilly Crescent. The force reported the incident has resulted in major disruption, with officers urging motorists to steer clear of the area. According to Wales247, emergency services remain at the scene, working to manage the situation while traffic congestion worsens in the vicinity.
Reports indicate the collision occurred during the morning rush, exacerbating existing pressures on Cardiff’s road network. Traffic is backing up on approach roads, turning what is typically a straightforward commute into a prolonged ordeal for thousands of drivers. South Wales Police thanked the public for their patience and promised further updates as the situation develops.
How Are Other South Wales Roads Affected?
Delays are not isolated to the collision site, with congestion spreading across multiple routes into Cardiff. Wales247 reported further hold-ups on the A470 southbound from Nantgarw to junction 32 at Coryton, piling additional strain on vital commuter arteries. Traffic Wales noted slow-moving conditions on the M4 between junctions 49 at Pont Abraham and 41 at Pentyla and Baglan, where wet weather has made driving hazardous.
Which Specific Routes Show the Worst Congestion?
On the A4232 between Culverhouse Cross and the M4 at Capel Llanilltern, delays are building in both directions, particularly during peak hours. Eastbound M4 traffic between junction 28 at Tredegar Park and 23A at Magor is also sluggish, affecting journeys towards the Severn Crossing. Westbound M4 drivers between Lon Las and junction 45 at Ynysforgan face added disruption after a separate collision blocked lane two, causing queues to lengthen.
What Advice Are Authorities Giving to Drivers?
Motorists across South Wales are being warned to allow extra time for journeys amid the widespread issues. Traffic Wales emphasised that stopping distances in rain can extend up to four times longer than on dry roads, advising drivers to reduce speed and maintain greater spacing between vehicles. Those heading westbound on the M4 near Ynysforgan are urged to approach with caution due to the ongoing lane blockage.
Road users are encouraged to check live traffic updates before setting out. According to reporting from Wales247, avoiding peak periods where possible could help mitigate the chaos, as even minor incidents are amplifying delays on busy corridors. South Wales Police reiterated the call to use alternative routes around the Romilly Road junction, where disruption from the serious collision persists.
The combination of the serious collision in Cardiff and adverse weather has transformed routine commutes into major challenges this Tuesday morning. As emergency services continue their work and traffic eases gradually, drivers can expect ongoing updates from South Wales Police and Traffic Wales throughout the day.
