Decoding Street Signs
Street signs are engineered to communicate life-or-death information in fractions of a second. Learn the subtle visual grammar of shapes, colors, and symbols that lets you read any road instantly.
Like Duolingo, but for Decoding Street Signs. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through Reading the Instant Visual Code and Navigating Complex Systems. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Decoding Street Signs
- Street signs use distinct outline silhouettes specifically so drivers can identify their meaning without seeing their painted face
- Looking at the back of an octagonal sign tells you cross-traffic has a stop sign, clarifying who has right-of-way
- Unique silhouettes help drivers identify sign urgency through heavy snow, fog, or mud
- The downward-pointing triangle silhouette is used exclusively for yield signs
- Octagons and inverted triangles are reserved strictly for stop and yield to prevent confusion with any lower-priority signs
- A yield sign requires slowing down and giving the right-of-way to other traffic, stopping only if necessary
- Diamond-shaped signs warn drivers of upcoming physical hazards, sharp curves, or changing road conditions
- A diamond sign signals proactive caution and deceleration ahead of time rather than a command to stop on the spot
- Regulatory laws are not posted on diamond signs; they advise rather than mandate immediate legal maneuvers
- Vertically oriented rectangular signs deliver enforceable legal commands and regulations
- Horizontally oriented rectangular signs deliver directional guidance, distances, and exit information
- The orientation of a rectangular sign signals whether it is commanding a rule or guiding navigation
- Red is reserved for prohibition, wrong-way warnings, and mandatory stops
- Yellow communicates permanent physical hazards like curves, pedestrian crossings, or merges
- Orange indicates temporary work zones, detours, and road crew hazards
- Green provides navigational guidance like destinations, mile markers, and highway exits
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Decoding Street Signs the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
You see an eight-sided, octagonal sign facing away from cross-traffic at an intersection. What does this tell you?
Get it right to open this lesson and 11 more in the app.
Where Decoding Street Signs takes you
- 1
Reading the Instant Visual Code
- The Shape and Color Code
- Decoding Pictograms and Symbols
- 2
Navigating Complex Systems
- Highway Wayfinding and Route Markers
- The Hidden Engineering of Legibility
2 sections · 4 units · 12 levels. Built to play, not to enroll.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Decoding Street Signs is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Decoding Street Signs today.
Download Tomo, search Decoding Street Signs, and play your first lesson in under a minute.