When May You Overtake a Vehicle on the Left? UK Driving Rules Explained

Many drivers are familiar with the rule that overtaking should normally be carried out on the right. However, there are situations where passing a vehicle on the left is permitted under UK road laws.

Understanding when you can legally overtake on the left is important for every driver, particularly if you're driving an unfamiliar hire van or larger commercial vehicle.

In this guide, we'll explain the rules around overtaking on the left, when it's allowed, and how to do so safely.

When May You Overtake a Vehicle on the Left?

1. In Slow-Moving Traffic

One of the most common situations where passing on the left is permitted is in congested traffic.

If traffic in the lane to your right is moving more slowly than the lane you're travelling in, you may continue driving in your lane even if this means passing vehicles on your right.

This often occurs on:

• Motorways
• Dual carriageways
• Multi-lane roads during rush hour

In these circumstances, you're not technically changing lanes to undertake; you're simply progressing with the flow of traffic.

2. When a Vehicle Is Signalling to Turn Right

You may pass on the left if the vehicle ahead is:

• Signalling to turn right
• Waiting to turn right
• Positioned in the centre of the road to make a right turn

Providing there is enough room and it is safe to do so, passing on the left is permitted.

Examples include:

• Vehicles waiting to enter a side road
• Vehicles turning into a driveway
• Vehicles waiting for a gap in oncoming traffic

3. One-Way Streets

On one-way roads with multiple lanes, drivers may pass vehicles on either side, provided road markings and traffic conditions allow it.

Always check mirrors and blind spots before changing lanes.

When Should You Avoid Overtaking on the Left?

Even when it may technically be legal, overtaking on the left should be approached with caution.

Avoid passing on the left when:

• Traffic is moving at normal speeds
• You need to weave between lanes
• Visibility is poor
• Road conditions are unsafe
• Other drivers may not expect your manoeuvre

Sudden lane changes can increase the risk of collisions, particularly when driving larger vehicles.

Why Van Drivers Need to Be Extra Careful

If you're driving a hire van, your visibility and stopping distances may be different from what you're used to in a car.

Larger vans often have:

• Bigger blind spots
• Longer braking distances
• Reduced rear visibility
• Wider turning circles

Before overtaking any vehicle, ensure you have a clear view of the road ahead and plenty of space to complete the manoeuvre safely.

Tips for Safe Overtaking

Whether you're driving a car, van or commercial vehicle, follow these simple overtaking guidelines:

Check Mirrors Frequently

Always assess traffic around you before changing lanes.

Signal Early

Give other road users plenty of notice of your intentions.

Maintain a Safe Speed

Avoid excessive acceleration or aggressive driving.

Don't Cut Back In Too Soon

Leave sufficient space between your vehicle and the one you've passed.

Watch for Blind Spots

Particularly important when driving larger vans and commercial vehicles.

Common Mistakes Drivers Make

Some drivers mistakenly assume that because another vehicle is travelling slowly in the outside lane, they can immediately move left and pass them.

While this may happen naturally in slow-moving traffic, deliberately changing lanes to undertake at speed can be considered careless driving and may lead to penalties if done dangerously.

The safest approach is always to drive predictably, remain patient and follow the flow of traffic.

Driving a Hire Van? Know the Rules Before You Travel

Whether you're hiring a van for a house move, business delivery or weekend project, understanding the Highway Code helps keep you and other road users safe.

At Abacus Vehicle Hire, we provide a wide range of cars, vans and commercial vehicles to customers across the South of England. Our team is always happy to answer questions about driving larger vehicles and choosing the right hire vehicle for your journey.

Before setting off, make sure you're familiar with the vehicle, plan your route and allow extra space for manoeuvres such as overtaking and lane changes.

Safe driving starts with good preparation.