How Kerbnow reads UK parking signs

Kerbnow reads a UK parking sign in three steps: you point your phone camera at the sign, the app reads every restriction on it, and it returns a plain-English answer to "can I park here right now?". Behind that, Kerbnow recognises the painted lines, the kerb dashes and the small print on each time plate, then weighs the current day, time and UK bank-holiday calendar before it answers, usually in about two seconds.

The camera recognition process

1. Open the app. Launch Kerbnow on iOS or Android. The core scan needs no account.
2. Point the camera at the sign. Kerbnow captures the sign and reads the restrictions, including the lines on the road, the dashes on the kerb, and every plate on the post, even when the text is faded or the sign stacks several rules.
3. Read the verdict. Kerbnow cross-references the live day, time and bank-holiday calendar, then tells you whether you can park, for how long, and the exact time you would need to move. The rule it used is shown alongside so you can check it.

Reading a fresh sign is a quick, secure round-trip to the Kerbnow scanning service, so a connection is needed to scan a new sign. For a deeper look at the camera experience, see scan any UK parking sign and the live, day-and-time answer.

The sign types Kerbnow handles

Kerbnow covers more than 50 UK sign variants, grouped here by the kind of restriction:

Time-limited bays and permit zones (CPZs)

Resident permit bays, visitor bays, shared-use bays, pay-and-display and time-limited bays inside a controlled parking zone. Kerbnow reads the bay marking, the zone code and the controlled hours from the entry sign.

Double and single yellow lines

Single yellow (no waiting during the signed hours) and double yellow (no waiting at any time). Kerbnow reads the line and the time plate together to work out whether the restriction is live now.

Loading and unloading restrictions

Kerb blips (the short dashes painted on the kerb face) and no-loading plates that ban loading separately from the waiting rule. Kerbnow flags when a loading ban overrides the allowance you would otherwise have.

Two-tier and contradictory signs

Posts that stack several restrictions, sometimes appearing to disagree. Kerbnow parses every panel, applies the order of precedence, and flags genuine contradictions instead of reading only the top line.

Faded or damaged signs

Worn lettering, sun-bleached plates and partly obscured text. Kerbnow reads what a quick glance often misses, and tells you when a sign is too damaged to trust.

Bank holiday and weekend variations

A "Mon–Fri" plate behaves differently on a bank-holiday Monday or a Sunday. Kerbnow checks the live UK public-holiday calendar for the relevant nation and the current weekday before it answers.

Multi-panel signs

Several plates on one post covering different bays, directions or hours. Kerbnow reads the whole assembly and matches it to where you are actually parked.

How accurate is Kerbnow?

In our own testing across real UK parking signs, Kerbnow returns the correct reading 99% of the time. A few things keep the answers reliable:

• It shows its reasoning. Every verdict comes with the rule it was based on, so you can confirm it against the sign rather than trusting a black box.
• It flags ambiguity. When a sign genuinely contradicts itself, is too faded to read, or looks unofficial, Kerbnow says so and tells you to find another spot.
• It is UK-specific. The model is trained and tuned on British signage and the TSRGD sign system, not a generic global model, which is where most parking misreads come from.

The 99% figure comes from our internal testing on UK signs and reflects single-sign reads; genuinely contradictory or badly damaged signs are harder, and on those Kerbnow flags the problem rather than force an answer.

Learn more

• What is Kerbnow? A short, factual overview of the app.
• UK parking rules hub. What the signs and markings actually mean.

Kerbnow is a sign-reading aid, not a legal ruling on whether you can park somewhere. Always check the answer against the physical sign in front of you.