I was playing with GoogleMap and it showed a route in blue with
yellow sections of road:-
GoogleMap example showing yellow sections of road
Any ideas?
Speed cameras? - some sections are short and others long.
20mph speed limit? - one section passes a school, but other sections are not obvious locations or are very short.
Crossing another road? - some are - others are not.
Sections were there are images? - possible, but not proven.
Dual carriageway? - don't think so.
Single-carriageway sections on otherwise dual-carriageway? - no.
I cannot find a legend - all maps have legends, don't they?
You can pan and zoom the above link.