Driving experts from the AA are alerting Brits to sat-nav issues among other common blunders that could see them slapped with hefty fines and penalty points. And it's all due to lesser-known rules about driving with dogs, around horses or even just using your sat-nav.

As more people hit the roads after the summer holidays, driving experts are cautioning that many motorists may be unwittingly flouting road laws. The AA has sounded the alarm for UK drivers about five obscure Highway Code laws and rules that could result in points on their licence or fines of up to £1,000 each.

While most Brits know they can't use their phone or tamper with their sat-nav while driving without jeopardising the safety of everyone in their car and surrounding vehicles, there's an additional caveat to this rule that might not be as well known.

According to Highway Code Rule 149, the experts warn that you can't operate a mobile phone or sat-nav without a secure holder. Understandably, many drivers rely on both these devices for navigation, and convenient holders that attach to your dashboard have made it much easier and safer to follow directions while keeping your eyes on the road.

Motorists are being warned by experts that using a mobile phone or sat-nav without it being in a fixed holder could result in six penalty points and a £1,000 fine. The pros caution: "Remember to be careful where you mount your device as there could also be repercussions if you do not have a full view of the road ahead."

A little-known offence but one that's widely flouted is the improper use of car horns. It turns out drivers are not allowed to honk their horn out of anger or frustration when the car is stationary, and it's similarly illegal to use it simply to greet someone familiar on the street.

Under rule 112 of the highway code, this could lead to an unlimited fine and up to nine points on your licence. The AA clarifies correct conduct: "Drivers must only use their car horn while the vehicle is moving, and for the purpose of warning other road users of their presence. You should not use your horn aggressively, while stationary, or when driving in a built-up area at night (between 11.30pm and 7am), unless another road user poses a danger."

Another obscure rule, which many may never encounter, involves horses on the road. The experts stress: "If drivers encounter a horse, from wild horses in areas like the New Forest or those being ridden by a horse rider, they should slow down to a maximum of 10 mph and refrain from sounding their horn or revving their engine while passing.

"When it's safe, drivers are advised to pass the horse slowly, allowing at least two metres of space."

Motorists who overtake horses too quickly or loudly could face an unlimited fine and anywhere between 3 to 9 points on their licence.

In-car distractions can also lead to hefty fines. For instance, arguing with passengers could result in a £1,000 fine and 3 penalty points, regardless of whether it's a heated conversation or full-blown fight.

This is because it can distract the driver and might cause them to drive "without due care and attention".

Other distractions include trying to read maps, listening to excessively loud music, eating, drinking and smoking. Failing to properly restrain your pet in the car also falls into this category but carries a greater risk as it could potentially injure your animals or others in the vehicle if you have to brake suddenly.

The AA suggests good restraints such as a seat belt harness, pet carrier, cage or dog guard.