The worrying findings come as an estimated 19% of the men surveyed gear up to cross the border by car for the football tournament this month.
Unexpected tailbacks could also become a feature of Gallic motorways this summer, as a healthy majority (57%) mistook the French toll booth symbol for a stop sign.
The survey of 2,000 drivers by insurance4carhire also found that around a quarter (24%) did not even know the motorway speed limit in dry conditions.
Spokesman Tim Thornhill said: "Before drivers hit the road we urge them to spend some time familiarising themselves with road signs in France – even if they have driven in the country before.
"Not knowing the rules of the road can be a costly mistake and could lead to an early exit."
Euro 2016 will kick off in Paris on June 10 and is expected to dominate sporting headlines until a champion is crowned exactly one month later.
Silly road signs around the world
British drivers 'confused about French road signs'
Spotted in Island of Hawaii.
The mind boggles.
Yes, this is a warning that snails are crossing the road near Westport on the west coast South Island, New Zealand.
There's a 'better than nothing' approach to this Baptist Church sign at Homer Street and Macon Road in Memphis, Tennessee, USA.
Apparently there are some pretty aggressive deer in the mountains of Waterton, Alberta, Canada. Maybe give this place a steer...?
If you're looking for somewhere to explode your vehicle, just don't do it here, as it's not permitted.
Don't go thinking you can rescue anyone in these parts...
This sign comes in very handy if you need to know how to get to Egypt while you're driving through Buckinghamshire.
This forbidding sign, spotted outside St. Stephen's Lutheran Church in Madison, Wisconsin, USA, won't bring in much of a congregation.
Does this one get the prize for being the most unhelpful sign of all???????
Just in case you're in any doubt: you can't park here.
This sign in Idaho, USA makes us hope the natives don't try to make us laugh!
Possibly the last sign you want to see when you've missed a turn-off. Unless you need directions for the tiny hamlet of Lost, 40 miles west of Aberdeen, Scotland, UK.
You'll have to leave your elephant behind if you're driving through Beijing...
Do not, under any circumstances, get the silly string out when you're here. We realise it's tempting but the penalties are harsh.
This sign was snapped in County Fermanagh,when the Lough Erne river burst its banks.
This is New Zealand's version of a pelican crossing.
This No Parking sign, miles from nowhere, was spotted along Prairie Chapel Road leading to President Bush's ranch near Crawford, Texas. The signs were placed for security while the president was at his 1,600-acre ranch outside town.
We've heard of cats resting under cars but never thought we'd have to check for penguins...
Just make sure you pick the right sign or you'll end up all confused...
This electronic road sign in Austin, Texas, was intended to warn motorists of construction near the intersection of Lamar and Martin Luther King boulevards were changed by hackers to give a deeper message.
If you're looking for daleks (and who isn't?), you've come to the right place. This sign led the public to a Dr Who exhibition held at Cardiff, South Glamorgan, Wales.
Does this sign want us to keep left or right? Confusing!
A leaning road sign in Glastonbury, Somerset practices what it preaches by demonstrating the message it's trying to get across.
We're guessing this road in Spain is just for cyclists and pedestrians to enter.
Neither of these signs sound very appealing. Which would you choose?
No, Prat Communal is actually a place in the Mid-Pyrenees, France. Glad you don't live there?
We reckon this confusing sign, photographed in London, is likely to have caused more accidents than it prevented...
Not an end in sight...
Ooops - looks like this sign is going to disappear underwater..
How many can there be in the desert in Baja, California?
This funny sign was spotted in Queensland, Australia.
Good advice from this rural street sign
Road sign Kent for the village of Ham and town of Sandwich Kent, England, UK
This Way, That Way, and Somewhere Else three-direction signpost at Blackheath village crossroads, just outside Guildford, Surrey.