Drivers in Essex are being told to look out for deliberate obstructions in the road following a spate of recent incidents.
Essex Police claim objects such as concrete blocks, wood and barbed wire have been left on unlit stretches of road across the county with the intention of causing danger to motorists.
The village of Tiptree has seen as many as nine separate incidents in the space of just 10 days.
No motorists or other road users have been injured so far, although Chief Inspector Nick Lee says this is only down to luck. He is determined to catch those responsible before a serious incident occurs.
Officers would like to speak to two white men, aged 20 to 30, seen wearing camouflage trousers and an orange and grey top, and a woman, aged 20 to 30, wearing grey and black clothing.
Anyone with information is urged to contact Essex Police on 101 or 999 in an emergency.
The first couple of reports were simply thought to be debris that had fallen in the road, yet it quickly emerged that there was a pattern to the incidents. Four cars and a bus have suffered thousands of pounds worth of damage.
Copyright Press Association 2016. Motoring News articles do not reflect the RAC's views unless clearly stated.