While every motorist must learn the Highway Code before passing their driving test, many remain clueless about how to respond when a police officer signals to them.
That's why Annie, a theory test instructor, has explained what common police arm signals mean - and precisely how drivers should react when one is directed at them on the road.
In a TikTok video, she tested her followers on the gestures, encouraging them to share their responses in the comments.
Accompanying the clip, she said: "Understanding police arm signals is essential for any driver. These signals are designed to communicate important instructions and ensure safety on the road.
"Familiarising yourself with these signals can help prevent misunderstandings during critical driving situations."
To start, she outlined the "stop" signal - an extended arm raised vertically - which indicates that motorists must halt immediately.
She added: "This signal is often used at roadblocks or during traffic control."
Subsequently, she addressed the "turn right" signal, explaining: "An arm extended horizontally with the elbow bent at a right angle and pointing upwards signifies a right turn. This is crucial to indicate your next move to surrounding vehicles and pedestrians."
Likewise, the "turn left" signal involves an officer holding their arm straight out horizontally, indicating that motorists should turn left.
She said: "It's vital for maintaining clarity on the road."
Finally, she demonstrated the "slow down/proceed with caution" signal, explaining that an arm moved up and down indicates drivers should reduce their speed or proceed carefully, particularly in changing traffic conditions.
Commenting on her post, one user said: "Thank you so much for that - really helpful."
Another added: "I didn't know, but now I do. Thank you."
Police can stop a vehicle for any reason, and drivers should always pull over as soon as it is safe to do so.
A government statement reads: "You’re breaking the law if you do not stop.
"If you’re stopped, the police can ask to see your driving licence, insurance certificate and MOT certificate.
"If you do not have these documents with you, you have seven days to take them to a police station. You’re breaking the law if you do not show the requested documents within seven days.
"The police can also give you an on-the-spot fixed penalty notice for many minor offences and make you take a breath test in certain circumstances.
"You can also have your vehicle seized if you’re stopped on suspicion of driving without insurance and for some other offences."