What does Highway Code Rule 300 say?

Rule 300 (Tramways (rules 300 to 307)) You MUST NOT enter a road, lane or other route reserved for trams. It is a legal requirement, it uses “MUST” or “MUST NOT”, so breaking it is a criminal offence that can mean a fine, penalty points, or disqualification.

Is Rule 300 a legal requirement?

Yes. Rule 300 uses “MUST” or “MUST NOT”, which marks it as backed by law. Disobeying it is a criminal offence and can lead to a fine, penalty points on your licence, or disqualification.

How is Rule 300 tested on the driving test?

Roadworks, crossings and tram routes can appear anywhere on a test route. The examiner watches that you read temporary signs and signals correctly and adjust your speed and position in good time, without hesitating unnecessarily.

What are the common mistakes related to Rule 300?

The faults examiners most often record around this part of the Code are: choosing the wrong lane because the temporary signs were read too late; braking harshly at a crossing or signal that should have been anticipated; stopping over a marking or in a box junction when the exit is not clear. Rehearsing the safe habit during lessons is the most reliable way to avoid them.

Highway Code · Rule 300

Highway Code Rule 300

Road works, level crossings and tramways (288 to 307). A legal requirement (MUST / MUST NOT).

Road works, level crossings and tramways
Legal requirement
OGL v3.0

What the rule says

Law · MUST

Rule 300 (Tramways (rules 300 to 307)) You MUST NOT enter a road, lane or other route reserved for trams. Take extra care where trams run along the road. You should avoid driving directly on top of the rails and should take care where trams leave the main carriageway to enter the reserved route, to ensure you do not follow them. The width taken up by trams is often shown by tram lanes marked by white lines, yellow dots or by a different type of road surface. Diamond-shaped signs and white light signals give instructions to tram drivers only. Law RTRA sects 5 & 8

Rule text reproduced verbatim from the official Highway Code (Crown copyright) under the Open Government Licence v3.0, see the attribution at the foot of this page.

In plain English

Stripped of the formal wording, Rule 300 comes down to one idea: rule 300 (Tramways (rules 300 to 307)) You MUST NOT enter a road, lane or other route reserved for trams. Because it is written with “MUST” or “MUST NOT”, it carries the force of law, ignore it and you are committing an offence, not simply driving badly.

It belongs to the road works, level crossings and tramways part of the Code, the habits a confident, considerate driver builds until they are automatic. The aim is not to memorise the sentence word for word, but to understand the hazard it protects you from, so you apply it without having to think when it counts.

If you are learning, treat this rule as one piece of a connected set rather than an isolated fact. The related rules below sit in the same section and reinforce each other, reading them together is how the road works, level crossings and tramways part of the Code starts to feel like common sense rather than a list to revise.

Because this is a legal rule, the consequences of ignoring it reach beyond the test: a “MUST” or “MUST NOT” breach can mean a fixed penalty, points on your licence, or in serious cases prosecution. Either way, the safe move is to build the habit early, while a driving instructor can correct it, rather than relearning it under test pressure. That is exactly what the practice routes and coaching in the DriveRoutes app are designed to help with, turning the rules below into the way you naturally drive.

Why rule 300 matters on the road

Temporary layouts remove the cues drivers rely on, so the risk of a wrong-lane decision or a late stop climbs. Reading the signs early and committing to the correct lane keeps you and the road workers safe.

Common faults examiners record

In the road works, level crossings and tramways part of the Code, the faults most often written on the marking sheet tend to be the same handful. Knowing them in advance is the quickest way to drive them out of your own habits:

Choosing the wrong lane because the temporary signs were read too late.
Braking harshly at a crossing or signal that should have been anticipated.
Stopping over a marking or in a box junction when the exit is not clear.

On the day

On the day, applying Rule 300 is about doing the safe, deliberate thing slightly earlier than feels necessary: read the situation in good time, observe fully, and act smoothly. The examiner is looking for planned driving, not perfection, and good habits formed in lessons carry you through.

Quick checklist

Read the situation early and plan your response.
Observe fully before you commit to anything.
Keep your speed suitable for the road and conditions.

More from Road works, level crossings and tramways

Related Highway Code rules

Rule 300, your questions

: Rule 300 (Tramways (rules 300 to 307)) You MUST NOT enter a road, lane or other route reserved for trams. It is a legal requirement, it uses “MUST” or “MUST NOT”, so breaking it is a criminal offence that can mean a fine, penalty points, or disqualification.

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