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In the ASA's ruling, it said it told Mars "not to condone or encourage irresponsible driving that was likely to breach the legal requirements of the Highway Code in their ads."

"Young people are among our most vulnerable road users, which is why the Highway Code emphasises the need to drive slowly and carefully around schools, and when passing a stationary bus carrying schoolchildren."

According to the Highway Code, a clearway sign means no stopping.

The Highway Code sets out what constitutes a safe stopping distance at various speeds in dry conditions.

The theory test consists of 50 multiple-choice questions testing candidates' knowledge of the Highway Code and guidance on driving skills, for which at least 43 correct answers are required.