How to read California road signs

Road signs are designed to be understood at speed, in bad light, by someone who may not read English well. The shape and the colour carry the meaning; the words only confirm it.

That is why an octagon is used for one instruction and nothing else, and why a driver who cannot make out the letters on a faded sign still stops. Learning the system means you are never guessing at a sign you have not seen before — you already know what class of thing it is.

These carry the law. They tell you to stop, to yield, which way you may turn, how fast you may go, where you may not park. Most are black and white; the ones that forbid something use red, and a red circle with a slash means the action shown is not allowed.

A regulatory sign is not advice. Ignoring one is a moving violation, which is why they are the group worth being certain about rather than approximately right.

Yellow diamonds warn you about the road ahead: a curve, a hill, a merge, a crossing, children, animals, a surface that behaves differently in rain. They describe a condition rather than issue an order, and the right response is to slow down and look.

Fluorescent yellow-green is used for the ones about people — pedestrians, cyclists, school crossings — because the colour is unusual enough to catch an eye that has stopped noticing yellow.

Orange means roadwork: a lane closing, a flagger, a detour, equipment entering the road. Conditions behind an orange sign change from week to week, so what it warns about will not match your memory of that stretch.

Green signs tell you where you are going, blue ones point at services and hospitals, and brown ones at parks and recreation areas. None of them instructs you to do anything, which is exactly why they are easy to skip past in a hurry and easy marks on a test.

Group them by family rather than memorising a list. Once the shape-and-colour system is in place, a new sign slots into a group you already understand and you are only learning one specific thing about it.

Then test yourself on the ones you get wrong, and find out why the answer you picked was wrong rather than only what the right one was. That is how this app is built: every sign carries its meaning in Armenian and English and the handbook rule behind it, and it all works offline.