Motorists taking to the roads this Bank Holiday face potential fines of up to £5,000 for breaching little-known Highway Code rules, with an estimated 20 million people expected to be travelling. Keith Hawes, director of Nationwide Vehicle Contracts, is highlighting five often-overlooked regulations that drivers could inadvertently breach.

Hawes said: "With roads expected to be especially busy this August Bank Holiday, and many travellers switching to cars due to rail disruption, it's more important than ever that drivers prepare properly before setting off."

Certain violations carry substantial penalties — a minor oversight could result in fines reaching up to £5,000.

The primary concern Hawes emphasises is the danger of driving while fatigued. This offence carries an unlimited fine, as tiredness is believed to be a factor in approximately 10 to 20% of all collisions.

Rule 91 of the Highway Code clearly states drivers must "not begin a journey if you are tired" and should ensure they get "sufficient sleep before embarking on a long journey".

Should a driver be found to have operated a vehicle while tired and subsequently caused a collision, this falls under dangerous driving. Upon conviction, penalties can include an unlimited fine, disqualification from driving, and in the most severe instances, imprisonment for up to 14 years.

The second most expensive error motorists can make is travelling with an unrestrained pet in the vehicle, which could land you with a fine of up to £5,000. Rule 57 of the Highway Code stipulates that pets must be properly secured to prevent them from distracting the driver or causing injury to themselves or others in the event of an emergency stop.

Drivers are advised to consult the Government website to determine which restraint method is most suitable for their pet.

When heading off for a weekend break, it's tempting to pack everything but the kitchen sink — however, there's a compelling reason to be mindful of how you load your vehicle, as it could set you back up to £300. Surpassing your car's recommended weight limit can make it harder to handle, increase petrol consumption, and put additional stress on the tyres and suspension, potentially raising the risk of a collision.

Under Rule 98 of the Highway Code, exceeding this limit is prohibited, and being caught doing so can result in a £300 fine and three penalty points. Should you cause an accident as a consequence, it may even render your insurance invalid.

Hawes said: "Simple oversights such as driving whilst tired, failing to secure pets or overloading the vehicle can lead to costly penalties and, more importantly, put lives at risk."

He added: "Plan your journey in advance, take regular breaks and make sure everything in your vehicle is safe and secure before travelling."