A 'ridiculous' bridge could be the lowest in Britain as only toddlers could walk under it without banging their heads.
At just 30 inches off the ground, the bridge off the M25 near Uxbridge is impossible for an adult to go under unless they duck or crawl.
Henry Allum, who explores unusual places on his YouTube channel Henry's Adventures reckons it's the lowest crossing on a public footpath in Britain with walkers hard-pushed to find one lower, MyLondon reports.
"It's a bit ridiculous, he said. "I don't think there could possibly be a lower bridge than this."
Viewers who don't get claustrophobic can watch as Henry measures the bridge and passes under it in his video.
As he crawls underneath, it does get a bit higher, but he remains very cramped and crouched over until he gets to the halfway stage where he can briefly stand up fully.
In the middle of the two carriageways he manages to shine a torch into the darkness showing him standing, before again having to crawl again.
"Not a good place to go if you don't like spiders," he quips.
The bridge is much higher at the other end, coming to 58 inches, but is still too short for the average adult to stand under comfortably.
It goes over a path and the River Colne Brooke and can be accessed from a footpath in Uxbridge, west London
Viewers took to the comments to share how entertaining they found the video.
On the news site viewers of his video responded: "Just wanted to tell you how much I enjoyed this video.
Another commented: "That is hilarious. Wasn’t expecting the video to make me laugh, especially the high bit in between the carriageways. Thanks."
]Others also shared their own experiences in attempting to walk the path.
One said: "We found this last year and got half way from the Uxbridge side but Mrs B got claustrophobic and we had to walk back! Great Video as always!"
A second commented: "I crawled under that earlier and went 'off piste' nearly ending up in the drink while attached to a large bramble.
"Keep to the bridleway and avoid this footpath if you have a bad back."
Henry stumbled across the bridge when he was making a video on the River Alderbourne, which is difficult to access because it is mostly on private land.
He asked viewers to comment if they know of a lower bridge on a public right of way.
"I did say if someone tells me of a lower bridge in London or the Home Counties I would go and make a video on that bridge too!" he added.
