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Map data is never perfect, and WhySoSlow is yours to correct. Your edits form a personal layer that always takes priority over the underlying map, syncs across your phones, and survives the next map refresh.

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Fix a wrong limit

If the limit shown is wrong for a stretch of road, override it: select the stretch, set the correct speed, confirm. The controls are large and there’s an undo, so it’s safe to do even while driving. Your override is stored by road geometry and name, so it stays put when the map data updates.

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Drop your own markers

Add markers for what the data misses:
  • Cameras — with a bearing, so they trigger a directional warning like the official ones. Add the enforced limit if you know it.
  • Hazards — accidents, checkpoints, potholes, roadworks, or anything else.
Permanent vs temporary markers are shown with a different outline colour. There’s no expiry — you manage them yourself, so a temporary hazard stays until you clear it.

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Three ways to add something

1

On the map

While parked, tap a spot on the map to add a limit override or a marker there.
2

In motion

Add a marker or fix the current road’s limit with a single large tap as you drive — confirm and undo keep it safe.
3

From an AI suggestion

Confirm a pre-filled suggestion from the AI sign advisor — it lands in the same confirm flow as everything else.
Everything you add or edit lives on one “My markers & limits” screen, where you can review and remove it. It all syncs to your account, so it’s there on every device you sign in on.