Drivers debated what the bizarre sign could mean with many joking around that it may be signalling an alien invasion. The rectangle sign features a drawing of a satellite sitting above a heavy vehicle or lorry in front of a blue background.
The HGV appears to have a diagonal line through the middle which is usually a warning for drivers not to do something.
The road user who posted the message on social media said: “This one wasn’t in the Highway Code when I took my test, Anyone any ideas?”
Fellow motorists tried their luck at guessing at the sign could mean with some suggesting it may be a warning for delivery drivers.
The motorist placed the coordinates where he found the sign which corresponded to a small road next to the village of Funtley near Southampton.
READ MORE: Ignoring this temporary road sign can hit drivers with fines
The sign attempts to warn drivers about the possible risks to avoid being caught out further down the pass.
Speaking to Express.co.uk, Mr Cousens said the images were picked to help those not able to understand English.
He said: “First introduced on the A48, this sign does not warn of an alien invasion but advises HGV drivers not to follow their sat nav down narrow country lanes.
“It’s main aim was to help foreign truck drivers avoid getting stuck out on rural roads.
Before the signs were installed, a Polish driver was found stuck for more than three hours on one tight bend after taking directions from his sat-nav device.
Residents had called for change after complaining that the road had been blocked three times in recent months.
A design from Traffic engineer Mark Simpson was approved by the Welsh Assembly for trials.
This trial was initially supposed to run for 12 months with plans to extend the scheme if it was considered successful.