As well as inconvenience to local residents and boaters, vehicle strikes on 200-year-old stone bridges cost the trust up to £1million annually in repairs, diverting funds away from vital work.
CRT asset engineer Andy Dobson said: “Hump-back bridges were built for the passage of horse-drawn carts, not for today’s modern vehicles and HGVs. Due to the large number of rural, narrow roads crossing the Lancaster Canal, it has more bridge strikes than any other.”
He explained that the bridges in this area are of particular interest, as their stone parapets were lowered and replaced with railings in the Second World War to deny shelter to invading enemy tanks and troops. Lancashire’s gently shelving beaches were considered a perfect spot for a large invasion force to land.
The narrow historic Lancaster Canal bridge is now a busy through-route for lorries. PHOTOS: CRT
The trust, which cares for 2800 historical bridges, will be testing the new system on Cockerham Road Bridge (No 79), near Forton, Lancashire, which was hit twice in 2022. In the past, the use of CCTV to provide constant recording of bridge strike hot spots in rural areas has proved prohibitively expensive due to a lack of power supply.
However, this new system is controlled by AI using a mobile phone signal and doesn’t continuously record but takes a few photos when it detects vehicle movement. The AI then assesses if the bridge has been impacted.
If there is no strike, the photos are deleted and if damage has been caused, trust staff receive a notification, allowing them to identify number plates to track down the offenders and claim full repair costs on their insurance.
Repairs were carried out in summer 2023 after another vehicle strike. PHOTOS: CRT
Last summer Cockerham Road Bridge had to be repaired again after yet another strike, at a cost of £25,000. The full-length white steel railings on the top of the stone parapet were also damaged and, in another innovation, have been replaced in sections, leaning away from the road to minimise the risk and make future accident repairs cheaper.
Andy added: “We desperately need motorists to slow down and take more care. We are grateful to Lancashire County Council who have been working with us over the last two years to install better approach signage to 15 at-risk bridges over the Lancaster Canal.
“And if the AI CCTV system works effectively, it could potentially be rolled out at other accident blackspots and even be used on sites at risk from vandalism and fly-tipping, saving the Trust time and money and most importantly protecting the nation’s precious canal heritage.”
