Do you have some more details you could share, like screenshots or trailers/videos? Sadly the video link to the trailer on YouTube is not working anymore.
This is one of our demos from 2008, which looks very similar (though we aren't using Google Maps data, we're mostly using OS map data). It's also long before an art pass, so the textures, trees, building, road etc are just placeholder.
This is Mike (who did the first lemmings)'s test to se how many lemming-like things you could render in the world. He, myself, and Bill (GTA physics) went on to build a fun game out of this where you could run over them in tanks and blow them up.
I worked at Real Time Worlds on that too. Probably before it was called My World, then I think we were calling it Real Driving or something then.
Small world!
Cheers James