It would be cool to have multiple selectable cities, and compare them like that. I suppose to do it 'fairly' though you'd want to offset them so the peak times

It would be cool to have multiple selectable cities, and compare them like that. I suppose to do it 'fairly' though you'd want to offset them so the peak times etc. lined up, so they all had a commuter rush at once. (London would be buzzing as I write, but the OP is pretty quiet – middle of the night in New York.)