Why has google maps on the iPhone changed its road colors?

Last night I was trying to avoid an accident on the motorway, and found that google has changed the colors of the roads, anyone know why they've done this, or is it just me?

UK not US

It's not just on the iPhone, it's on everything.

Looks like they are updating it. It doesn't look good and is more difficult to read the maps now. Maybe it's to make it look more like american maps?

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