A worker on the Aberdeen bypass was taken to hospital with head injuries after a falling piece of timber cracked his hard hat apart and knocked him unconscious.

The Press and Journal reports that the accident took place just south of the River Dee crossing yesterday afternoon.

It is understood the man had raised concerns about the “unsteady” nature of the plank immediately before it came crashing down on his head.

Witnesses said the force of the blow smashed apart his protective helmet, leaving him unconscious and with a “deep” laceration.

The man regained consciousness at the scene, but was taken to Aberdeen Royal Infirmary by ambulance to be checked over.

Transport Scotland said contractors were investigating the circumstances and would use the findings to enhance site safety.

A spokeswoman said: “The project contractor, Aberdeen Roads Limited, has confirmed that an incident took place on its site earlier today resulting in one of its operatives being taken to hospital.

“The contractor is now undertaking an investigation in to the cause of the incident and will implement any lessons learned throughout the site.

“Transport Scotland will continue to work with Aberdeen Roads Limited to enhance the health and safety of the local community and the workforce.”

The incident is the latest in a number of accidents on the AWPR project. A worker at the Milltimber stretch of the site was left with cracked ribs, a liver tear and dislocated toes after being crushed by a half-tonne pipe back in March.