The Middle Lane Hogger Trap: Can You Legally Pass on the Left?

You’re trundling along the M4 at a sensible speed in the left-hand lane. Up ahead in Lane 2 is a crossover sitting at precisely 57 mph. There isn’t a single vehicle in front of it for miles and as usual the driver is completely oblivious.

So the question is you’re approaching at 60 mph. Do you indicate right, move out to Lane 3, overtake, and work your way back across to Lane 1? Or do you hold your speed and slide past on the left?

WalesOnline went through the Highway Code and the official police guidance on undertaking at the start of October. The answer is a firm no, with a couple of exceptions.

The Rule: Undertaking Is a £100 Gamble

The Highway Code doesn’t leave much wiggle room. Rule 268 says: “Do not overtake on the left or move to a lane on your left to overtake.”

There’s no offence called undertaking as such. If you swing into the left lane to get past a middle-lane driver, or use Lane 1 to pass traffic on your right, police can treat it as careless driving. That’s a £100 fixed penalty and 3 points on your licence. In England and Wales, if it goes to court, magistrates can impose an unlimited fine, up to 9 points, or a driving ban. Fines aren’t the only way the law catches out van drivers. Tyre tread is another

You don’t need a police car behind you to get caught, either. Operation Snap, which started in North Wales, lets other motorists send in dashcam footage, and most forces now run their own version. In Wales it goes through GoSafe; in England, footage goes to the force covering wherever the incident happened.

Why It Matters More in a Van

If you drive a Sprinter, Transit or any big panel van, the fine is the least of your worries.

UK drivers are conditioned to check their right mirror far more carefully than their left, because that’s where overtaking is supposed to happen. When a middle-lane hogger suddenly realises their exit is coming up, they’ll often swerve left with barely a glance.

It seems to be a rarity that someone will indicate to overtake you, let alone signal their intention to move to the inside lane, lane 1.

If you’re passing on the left, you’re sitting in their near-side blind spot. If they drift into you, a heavy van at motorway speeds won’t stop or swerve easily.

The Exceptions: When Passing on the Left Is Allowed

The Highway Code allows two situations.

1. Congested, slow-moving queues. If traffic is heavy and the lanes are moving at similar speeds, your lane may move faster than the one to your right. You’re allowed to keep up with your own lane, even if that means passing cars on your right (Rule 268). What you can’t do is weave between lanes to get ahead.

2. A vehicle turning right. If the vehicle in front has signalled and positioned itself to turn right, you can pass on the left if there’s room to do it safely (Rule 163).

“The bloke in Lane 2 was doing my head in sitting in the lane for miles” isn’t on the list.

What About the Middle-Lane Hoggers?

Sitting in Lane 2 with an empty Lane 1 alongside isn’t allowed either. Rule 264 says you should drive in the left-hand lane unless you’re overtaking. Police can pull over lane hoggers and give them the same £100 fixed penalty and 3 points for careless driving.

The Van Life Verdict

In a van, Lane 1 at 60 mph is the sweet spot. The frustration comes when a lane hogger boxes you in and you have to pull out across two lanes to get past someone doing 57.

The maths helps. Over 30 miles, 60 mph takes 30 minutes. At 57 mph it takes 31.6 minutes (30 ÷ 57 × 60). That’s about a minute and a half, which is less than you’d lose queueing for a service station coffee.

If traffic is flowing freely, take the long way round: pull out, pass them, and move back over. It’s tedious, but it keeps your licence clean. And if you ever find yourself in Lane 2 with an empty road ahead of you, move over. Lane 1 is lovely this time of year.

FAQs

Is undertaking illegal in the UK?

There’s no specific offence called undertaking, but Highway Code Rule 268 says not to overtake on the left. Doing it outside the permitted exceptions can be treated as careless driving, which means a £100 fixed penalty and 3 points, or more if it goes to court.

Can I pass on the left in a motorway traffic jam?

Yes, if traffic is congested and your lane is moving faster than the one to your right, you can keep pace with your lane. Changing lanes to get ahead isn’t allowed.

Is middle lane hogging illegal?

Rule 264 says to keep to the left-hand lane unless you’re overtaking. Police can treat hogging the middle lane as careless driving, with the same £100 fine and 3 points.

Can another driver report me with dashcam footage?

Yes. Operation Snap lets drivers submit dashcam footage to the police force covering the area where the incident happened, and they can issue penalties after the event. In Wales, all four forces use the GoSafe portal.