Traffic is the reason many people don’t start cycling to work. But riding alongside other vehicles is a skill, not a lottery — and the UK Highway Code gives cyclists clear, practical tools to do it safely. Here’s what you need to know.
Primary position: take the lane when it matters
The 2022 update to the Highway Code introduced clearer guidance on road positioning through Rule 72. Cyclists are advised to ride in the centre of their lane — the “primary position” — in these situations:
- On quiet roads or streets
- In slower-moving traffic
- Approaching junctions or road narrowings where it would be unsafe for a driver to overtake you
Taking the lane prevents drivers from squeezing past when there isn’t enough room to do so safely. On a quiet road, if a faster vehicle comes up behind you, you can move left to let it past — but only if it’s safe to do so. The choice is yours, not the driver’s.
Secondary position: when to move left
The “secondary position” — roughly a metre from the kerb — is appropriate when conditions allow vehicles to overtake you comfortably within the lane. On wider roads with reasonable traffic speeds, this gives traffic space to pass while keeping you clear of the door zone of parked cars.
A rough rule of thumb: if there’s enough width for a car to overtake you without crossing the centre line, secondary position is fine. If there isn’t — a narrow road, a pinch point, parked vehicles — move to primary and let traffic wait until there’s a safe gap.
Junctions: the highest-risk point
Most cycling incidents happen at junctions. A handful of habits reduce the risk significantly:
- Make eye contact with drivers waiting to pull out. Don’t assume you’ve been seen just because you’re there.
- Signal before turning. Extend your arm horizontally in the direction you’re turning — the standard arm signal described in the Highway Code’s signals section. Do it in good time so drivers behind you can react.
- Take primary position early when turning right. Move towards the centre of the road before the junction, not at it. This removes the ambiguity for drivers behind you.
- Don’t hug the kerb when going straight on. Positioning too far left at a junction makes you invisible to vehicles turning left alongside you. Hold a clear, visible line through the junction.
Advanced Stop Lines (bike boxes)
Many traffic lights in UK towns and cities have an Advanced Stop Line — a marked box with a bicycle symbol positioned in front of the main stop line. When the lights are red, cyclists may cross the first stop line to enter the box. You must not cross the second (final) stop line.
Motorists must stop at the first white line and must not enter the box at all. Using the ASL puts you clearly in front of traffic so you can move off first when the lights go green — reducing the risk of being cut up by vehicles turning left or right.
What the law says about drivers overtaking you
Highway Code Rule 163 (updated January 2022) requires drivers to leave at least 1.5 metres when passing cyclists at speeds up to 30 mph, and to give more space at higher speeds. Drivers should wait behind you rather than squeeze past if they cannot meet that clearance.
The 1.5-metre guideline sits in the Highway Code rather than statute law, but it sets a clear standard for what “adequate space” means. Riding in primary position makes it harder for drivers to misjudge the gap — and harder for them to argue they had enough room if they didn’t.
Roundabouts
Roundabouts are genuinely difficult for cyclists. The Highway Code acknowledges that cyclists can keep to the left of a roundabout even when going straight ahead or turning right — but you’re vulnerable to vehicles exiting across your path.
A few approaches help: signal right as you go round to indicate you’re still on the roundabout, then signal left before your exit. On multi-lane roundabouts with heavy traffic, taking a lane (primary position) is often safer than staying at the edge and risking being cut off by a left-exiting vehicle. Use your own judgement based on the speed and behaviour of the traffic around you.
Visibility
Positioning gets you a long way, but being seen is equally important. After dark or in seriously reduced visibility, Highway Code Rule 60 requires a white front light and a red rear light. For a full breakdown of what’s legal and what’s actually useful for commuting, read our guide to the best bike lights for commuting.
Poor visibility isn’t just about darkness — heavy rain, dawn, dusk, and tunnel underpasses all count. Our guide to cycling in the rain covers waterproofing, braking on wet roads, and what to do when drivers can barely see through their windscreens.
Dealing with bad driving
You’ll encounter close passes, people pulling out without looking, and drivers who don’t know what a bike box is. Most of it is inattention rather than malice.
The most useful response is to ride predictably: hold your line, signal clearly, and position yourself so drivers can see you before situations develop. Swerving in response to a close pass is more dangerous than the pass itself — hold steady. If you have dashcam footage of a genuinely dangerous manoeuvre, you can report it to the police. CyclingUK maintains up-to-date guidance on how to do this effectively.
New to riding to work? Our beginner’s guide to cycling to work covers route planning, kit, and getting started from scratch. If you’re commuting through autumn and winter, our winter cycling guide covers road conditions and cold-weather preparation.
Frequently asked questions
Is it legal to ride in the middle of the road?
Yes — in the right situations. Highway Code Rule 72 specifically advises cyclists to ride in the centre of their lane on quiet roads, in slow-moving traffic, and when approaching junctions where it wouldn’t be safe for a driver to overtake. The 2022 update to the Highway Code made this guidance explicit.
How much space do drivers have to give cyclists when overtaking?
Highway Code Rule 163, updated in January 2022, says drivers should leave at least 1.5 metres when overtaking cyclists at speeds up to 30 mph, and give more space at higher speeds. This is Highway Code guidance rather than a fixed statutory minimum, but it sets a clear expectation for drivers.
Can I use the bike box (ASL) at traffic lights?
Yes. When the lights are red, cyclists may cross the first stop line to enter the advanced stop box, but must not cross the final stop line. Motorists must stop at the first white line and must not enter the box.
Do I have to signal when turning on a bike?
The Highway Code recommends cyclists signal their intentions before turning, using the standard arm signal — arm extended horizontally in the direction of travel. It’s not expressed as a strict legal obligation, but signalling clearly is fundamental to riding safely in traffic.
What should I do if a car passes dangerously close?
Hold your line — swerving is more dangerous than the close pass itself. If you have dashcam footage of a dangerous manoeuvre, you can report it to the police. CyclingUK’s website has guidance on how to report close passes and what qualifies as careless or dangerous driving.
