Correct-ish UK road colours
• Blue motorways
• Green trunk roads*
• Google doesn't distinguish between A and B roads (red and yellow), so there is a compromise orange colour for "arterial" roads.
Road colours exactly the same as they were before Google made everything orange.
*Major route between primary destinations directly under control of Highways Agency (or devolved equivalent) rather than local authority. Distinguished by having road signs with a green background.