Motorists are experiencing delays as a major Essex road has been blocked after a crash. 

Following a collision on the A12, traffic has built up on the northbound carriageway. 

The incident took place between J24, Kelvedon, and J25 this afternoon. 

Long delays and traffic queues reaching back to J23 have been reported. 

Drivers are asked to avoid the area if possible and allow extra time for their journeys until further notice.