Police are warning drivers after a van had its windscreen smashed in one of four cases of objects being through into the road on the A47.

A white Ford Transit was travelling eastbound between the Pullover and Hardwick roundabouts at 8am on Monday September 12, when an object smashed into its windscreen, causing extensive damage.

Monday’s incident is one of four reports of objects being thrown onto the carriageway in recent weeks, and investigating officer, PC Amy Laws from King’s Lynn Police station, has warned drivers to be vigilant.

She said: “It is currently unknown what has caused this damage. However, at this time, it is believed that an object may have been thrown from a flyover. The victim was travelling at approximately 60-70mph and if he had not acted so swiftly, or the roads were busier, the outcome could have been a lot worse.

“The three other recorded incidents involve HGVs travelling on the A17 near to Hay Green Road North on Tuesday July 5, Tuesday July 19 and Tuesday September 6 at approximately 4am. On each occasion a golf ball sized rock has been thrown into the carriageway, smashing the windscreen.

“We treat reports of this nature very seriously because of the potential repercussions. I would like to warn motorists about this worrying trend and ask them to contact us immediately on 999 if they see someone acting suspiciously near to a flyover or the side of the road.”

Anyone who witnessed any of the incidents or anyone with information should contact PC Amy Laws from Kings Lynn Police Station on 101.

Alternatively, contact Crimestoppers anonymously on 0800 555111 or via their anonymous online form at http://www.crimestoppers-uk.org/.