Millions of motorists drive on motorways around west London every day, where broken down vehicles on the hard shoulder can be a regular occurrence.
Some kindhearted strangers will stop to offer a helping hand to those in need - but new dashcam footage reveals they might be in danger of being caught out in a 'petrol-for-gold-jewellery' scam.
Posting on YouTube, driver 'Chris' claimed he nearly fell for the trick when he pulled over for a man on the hard shoulder, as he left the M25 before taking the M4 to Heathrow earlier this month.
Police have repeatedly warned motorists of the scam since 2015, but this could be the first time it has been caught on camera.
Speaking to Get Surrey , 'Chris' said: "I didn't notice anything suspicious at first. I was concerned about his location, not everyone would be doing 70mph around that bend.
"At an early point I realised what he was after.
"An honest person would have been grateful for the offer of small assistance."
Footage shows a conversation between the unidentified man who asks 'Chris' for £50 in exchange for a ring.
"Beware of the petrol and rings roadside scam. Talk through it or simply drive off. Or, as in this case, both.
"Be mindful of stopping to help on the motorway as this can be very dangerous.
"You don't know who you're stopping for, but also you are at a massive increase of risk on the side of a fast moving carriageway."
Police in Surrey are looking into the incident and the case will be referred to Thames Valley Police as this part of the M25 comes under its power.
Thames Valley Police said the incident had not yet been reported to the force.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can even set it to receive push notifications for all the breaking news in your area