A car accident is causing delays in the Probus area near Truro.
Truck Hill is partially blocked and traffic is queuing around Fore Street junction after a blue Volkswagen Passat was involved in a crash at around 8am this morning.
A passing motorist also described seeing a tractor and a works truck at the scene.
Police and ambulance crews are at the incident, but it is understood that no one is seriously injured.
Traffic is moving slowly, but motorists are being warned to expect delays.