A significant stretch of the A40 near Llandeilo, Carmarthenshire, was brought to a standstill today following a serious road traffic collision, prompting authorities to close the route in both directions and urging motorists to seek alternative travel arrangements.

The incident unfolded between the Castle Dryslwyn turn-off at Felindre and Carmarthen Road in Llandeilo early this morning. Emergency services, including Dyfed Powys Police and paramedics, arrived swiftly at the scene to deal with the fallout of the crash. Details about the number of vehicles involved and potential injuries have not yet been confirmed by officials, leaving many local residents and regular commuters anxious for further updates.


Police issued a statement appealing to the public to avoid the area and to plan their journey via alternative roads, citing the need to keep the route clear for emergency crews. In a message shared early in the day, a spokesperson said: “The A40 at Cross Roads, Dryslwyn – Pont Myddyfi Cross Roads towards Llandeilo, is currently closed due to a collision. Please avoid the area and seek alternative routes.”
The closure quickly led to considerable congestion as both local and through traffic were diverted, resulting in extended travel times and widespread frustration. The A40 serves as a major artery for westerly and easterly travel across this part of south-west Wales, so any disruption is keenly felt by both local communities and those relying on the road for longer-distance journeys.
Whilst those living nearby are used to occasional agricultural or weather-related delays, collisions of this scale are less frequent but always bring sharp reminders of the importance of vigilance on rural routes. Commenting on the incident, traffic analysts noted that crashes on the A40 can lead to significant knock-on effects given the limited options for diversion in more remote stretches between towns and villages.
Meanwhile, local businesses reported a lull in activity as deliveries and customers struggled to navigate around the closed section of the A40. “We’ve had to re-arrange a number of appointments and shipments today,” observed one trader based in Llandeilo. “Disruption like this just shows how reliant we all are on the main roads.”
Public transport users also faced challenges, with reported delays on bus services and some cancellations due to the need to reroute vehicles safely around the incident site. The situation highlighted the vulnerability of rural transport networks to sudden roadblocks, particularly during peak hours or in the summer season when tourist traffic builds.
Dyfed Powys Police have yet to release further details regarding the circumstances of the crash, but investigations are understood to be ongoing. The force has assured the public that updates will be issued as soon as it is safe and feasible to do so, and there has been a clear emphasis on keeping the population informed.
As the day progressed, traffic monitors suggested that queues were beginning to ease slightly as diversions became established, although drivers were still advised to check for real-time updates before travelling. There was no immediate estimate as to when the affected stretch of the A40 might reopen, with authorities prioritising the thorough examination of the scene and safety checks before allowing vehicles through once again.
In the meantime, residents and drivers are urged to remain patient and to follow official guidance, with hopes that the road will be restored to normal use as soon as possible. The incident serves as a sobering reminder of the unpredictabilities inherent in road travel and the critical role emergency services play in ensuring public safety on Welsh roads.