Mnemonics
UK theory test mnemonics that actually work
Last updated
The UK theory test rewards memorising a small set of figures — stopping distances, stud colours, crossing names — that don’t change between sittings. Below are the mnemonics that work. Each is anchored to the Highway Code rule it comes from, so you can verify the rule before relying on the trick.
Stopping distances — Rule 126
The Highway Code publishes a fixed “Typical Stopping Distances” table at Rule 126. Every multiple-choice paper carries at least one question whose answer is a row from that table. Memorise the figures and the mnemonic that connects them.
| Speed | Thinking | Braking | Total | Approx. car lengths |
|---|---|---|---|---|
| 20 mph | 6 m | 6 m | 12 m (40 ft) | 3 |
| 30 mph | 9 m | 14 m | 23 m (75 ft) | 6 |
| 40 mph | 12 m | 24 m | 36 m (118 ft) | 9 |
| 50 mph | 15 m | 38 m | 53 m (175 ft) | 13 |
| 60 mph | 18 m | 55 m | 73 m (240 ft) | 18 |
| 70 mph | 21 m | 75 m | 96 m (315 ft) | 24 |
Mnemonic 1: thinking distance in feet = speed in mph
Notice the “Thinking” column. At 20 mph, thinking distance is 20 ft. At 30 mph, 30 ft. At 70 mph, 70 ft. Speed in miles per hour equals thinking distance in feet — a near-perfect 1-to-1 mapping. (In metres, it’s roughly 0.3× speed; the feet version is the cleaner mental shortcut.)
Mnemonic 2: stopping distance multipliers
Each step up the speed scale raises the stopping-distance multiplier by 0.5:
- 20 mph × 2 = 40 ft
- 30 mph × 2.5 = 75 ft
- 40 mph × 3 = 120 ft
- 50 mph × 3.5 = 175 ft
- 60 mph × 4 = 240 ft
- 70 mph × 4.5 = 315 ft
The figures match the Highway Code table to within a couple of feet at each row. Knowing the multiplier rule means you can reconstruct the table from memory.
The two-second rule — Rule 126 again
Allow at least a two-second gap between you and the vehicle in front on high-speed roads and in tunnels where visibility is reduced. The gap should be at least doubled on wet roads and up to ten times greater on icy roads.
The mnemonic: “Only a fool breaks the two-second rule.” Pick a fixed roadside object — a sign, a bridge — as the vehicle in front passes it, then count: “Only a fool breaks the two-second rule”. If you pass the same object before you finish the sentence, you are too close.
Motorway stud colours — Rule 132
Five stud colours, each in a fixed position. Mnemonics that work:
| Colour | Where |
|---|---|
| White | Between lanes (centre and lane dividers) |
| Red | Left edge of the road |
| Amber | Right edge / central reservation of a dual carriageway or motorway |
| Green | Edge of the main carriageway at lay-bys and slip roads |
| Green/yellow | Temporary adjustments to lane layouts (e.g. contraflows) |
Two mental shortcuts:
- “Red on your left, amber on your right.” Visual symmetry — red brake lights sit on the left of the car ahead; amber indicators are on the right side of the motorway central reservation.
- “Green = go (off / on the main road).” Green studs are the boundary between the main carriageway and lay-bys, slip roads, exits — places you are going onto or off of.
The six UK pedestrian crossings
Six named crossing types appear in the Highway Code. Each has a distinctive feature you can memorise without conflating it with the others.
| Crossing | Who it’s for | Distinctive feature | Rule |
|---|---|---|---|
| Zebra | Pedestrians | Black-and-white stripes; no lights. Drivers MUST give way to anyone on the crossing. | 195 |
| Pelican | Pedestrians | Light-controlled with a flashing amber phase — give way to pedestrians still on the crossing. | 196 |
| Puffin | Pedestrians | Light-controlled with sensors that detect waiting pedestrians; no flashing amber. | 199 |
| Toucan | Pedestrians and cyclists | “Two can” cross together. No flashing amber. | 199 |
| Pegasus / Equestrian | Horse riders (and pedestrians) | Higher control button (about 2 m), wider crossing, horse symbol on the light. | 199 |
| Parallel | Pedestrians and cyclists, side-by-side | Zebra-style stripes with a parallel cycle lane next to them; MUST give way to both. | 195 |
Mnemonic: name → user
- Pelican — “PEdestrian LIght CONtrolled.” Pedestrians only, with a flashing amber phase.
- Puffin — “Pedestrian User-Friendly INtelligent.” Sensors, no amber.
- Toucan — “TWO CAN cross.” The toucan is the only crossing that lets cyclists ride across rather than dismount.
- Pegasus / Equestrian — Pegasus is a mythical horse. Horses. Easy.
- Parallel — Two parallel crossings side by side (zebra + cycle lane).
Road sign shapes — what the shape itself tells you
UK road signs follow Vienna-Convention shape conventions, codified in the Know Your Traffic Signs booklet (gov.uk). The shape itself tells you what kind of sign it is, before you read it.
| Shape | Purpose | Examples |
|---|---|---|
| Circle | Gives an order (you MUST do, or MUST NOT do) | Red circle = prohibitory (No entry, 30 mph limit). Blue circle = mandatory (Turn left, Bus lane). |
| Triangle | Warning | Red-bordered triangle = warning (Bend ahead, Pedestrians crossing). |
| Inverted triangle | Give way | Only used for the “Give Way” sign at junctions. |
| Rectangle | Information | Blue = motorway info; green = primary route; white = local route/parking info. |
| Octagon | Stop | Used only for the “STOP” sign — the only octagonal sign on UK roads. |
Mnemonic
“Circles command, triangles warn, rectangles inform, octagons stop.”
Sub-rule for circles: red border means don’t; blue background means do. “Red restrains, blue obliges.”
Vehicle checks — the POWDER mnemonic
Before a long drive (and before the practical test’s “show me, tell me” section), drivers are expected to check the vehicle. There’s no single Highway Code rule listing them — Annex 6 covers vehicle maintenance generally — but the POWDER mnemonic is the most widely-taught summary.
| Letter | What to check |
|---|---|
| P | Petrol (or fuel level / charge level for an EV) |
| O | Oil (engine oil dipstick when cold) |
| W | Water — engine coolant level and screen-wash reservoir |
| D | Damage (bodywork, lights, mirrors, wipers — also dipped headlights working) |
| E | Electrics (lights, indicators, brake lights, fog lights, hazards) |
| R | Rubber (tyre tread ≥ 1.6 mm, pressure, no cuts or bulges) |
The tread-depth answer is fixed: 1.6 mm minimum across the central three-quarters of the breadth of the tread, around the entire outer circumference (Motor Vehicles (Construction and Use) Regulations 1986, Reg 27). Worn below that, each tyre is a £2,500 / 3-point endorsement.
MSPSL and MSM — observation routines
The Highway Code refers to MSM (Mirror–Signal–Manoeuvre) at every junction and lane change (e.g. Rule 159 on moving off). Driving instructors expand it to MSPSL for the practical test.
| Letter | Step |
|---|---|
| M | Mirrors — check all mirrors |
| S | Signal — indicate |
| P | Position — move to the correct part of the lane |
| S | Speed — adjust speed for the manoeuvre |
| L | Look — final look (and blind-spot check) |
MSM is in the Highway Code itself; MSPSL is a teaching routine rather than a rule, but the test treats it as the expected approach.
Eyesight — the 20-metre rule
You must be able to read a vehicle number plate from 20 metres in good daylight — or 20.5 metres for an old-style (pre-September 2001) number plate. Mnemonic: “20 for the modern, 20-and-a-half for the antique.”
Sources
- GOV.UK — Highway Code (Rules 103–158, including 126 stopping distances and 132 stud colours)
- GOV.UK — Highway Code (Rules 195, 196, 199 — crossings)
- GOV.UK — Know Your Traffic Signs (sign shapes)
- GOV.UK — Highway Code Annex 6 — vehicle maintenance
- GOV.UK — Driving eyesight rules
- legislation.gov.uk — Motor Vehicles (Construction and Use) Regulations 1986, Reg 27 (tyre tread depth)
Highway Code excerpts are reproduced under the Open Government Licence v3.0 .