The Highway Code sets out the rules motorists on the UK's roads are required to follow.
In some cases, failure to follow the rules could result in a hefty fine, or points added to your licence. With the August Bank Holiday weekend coming up, many of us are planning to take road trips that could see our cars splashed in muddy puddles, or otherwise be covered in dirt and dust.
But one Highway Code regulation could see you fined up to £1,000 for having a dirty number plate, Lincolnshire Live reports.