Change a road, then drive down it. That's the whole idea.
Open the editor and you're looking down at Cambridge from above.
Tap the × or anywhere off the road to close the card.
Three things, each with a minus and a plus.
| How wide? | How much tarmac there is, kerb to kerb. Goes up and down half a metre at a time. |
| Lanes going one way Lanes coming back | How many lanes each direction. A one-way street only shows one of these. |
| Round the corners | Only shows up on roads with a sharp corner. Turns the hard kink into a curve. |
Put it back undoes everything you've done to that one road. Undo at the top steps back through your changes one at a time.
Add a lane and the road gets wider on its own, so the lanes actually fit. That's meant to happen.
If something isn't allowed — like taking away the last lane — it says so and puts it back. Nothing breaks.
Press Drive it. The simulator opens in a new tab with your changes already in it.
The one rule that trips people up. Your changes are saved in this browser, on this web address. Edit here and drive here, and it works. Edit on the website and drive on your own computer, and it won't — they're two different places. Use Save a copy to carry work between them.
Your work saves by itself as you go. You don't have to press anything.
my-roads.json — a file with everything you changed.| My changes disappeared | Different web address, or a private window. Private windows throw everything away when you close them. |
| The driving tab shows the old road | Reload it. |
| I can't find a road | Zoom in until names appear. The full editor has a search box. |
| I've made a mess | Undo, as many times as you need. Or Put it back on each road you touched. |
The full editor does everything this one does, plus a lot more.
Move the road itself, draw islands and central reservations, place street lights, paint crossings and stop lines, and compare against the original. It shares your work with this editor, so you can start here and finish there.