Who Wants To Be A Millionaire viewers were shocked after host Jeremy Clarkson struggled to answer a question on the Highway Code.

As you’re probably aware, Clarkson has had a lengthy career as a motoring journalist as well as fronting the wildly successful car show Top Gear for 13 years, before moving on to The Grand Tour, also centred around motoring and cars, in 2016.

So you’d be forgiven for assuming the Clarkson’s Farm star knows a thing or two about the rules of the road, right?

Well, not according to an episode of Who Wants To Be A Millionaire, where viewers saw him stumbling over a question about the Highway Code.

ITV

David, the quizzer in the hot seat, was asked: “According to the Highway Code, what shape is the standard sign giving the order to ‘Stop’?”

And he had the choice of pentagon, hexagon, heptagon or octagon for the answer.

With £15,000 on the line, David didn’t know the answer, so he used a lifeline and phoned a friend, but the friend didn’t know, prompting him to use another lifeline and ask Clarkson.

Now, while David most likely assumed Clarkson would be able to provide the correct answer no bother, it didn’t quite turn out like that.

ITV

Clarkson said: “Here’s what I think… I don’t know. Honestly I’ve no idea.”

He then joked: “I’m always going too fast to read them.”

Clarkson went on to say he thought it was ‘almost certainly a hexagon’ but that upon having another think about it, he was worried it could be an octagon.

The TV host then joked that he last looked at the Highway Code all the way back in 1977.

As the pair pondered the question, Clarkson eventually decided on octagon - but as he wasn’t completely sure, David used another lifeline and took away two of the wrong answers.

This left him with pentagon and octagon - so following Clarkson’s suggestion, he opted for the latter, which was correct.

Although they got the right answer in the end, viewers were shocked to find that Clarkson didn’t know the answer straight off the bat.

Responding to a clip of the question on YouTube, one person wrote: “You'd think that with all his past experience in car-related programs, Jeremy would know to look at some of these signs on occasion.”

Someone else said: “Dude, seriously? No wonder so many accidents happen every year.”

While over on Twitter, one surprised viewer commented: "Can’t believe Clarkson doesn’t know what shape a stop sign is, I’ve been driving five minutes and I know."