Steve, you could try one of the ITO Maps to see if that shows what you are looking for?
e.g. [ITO - Map (Speed Limits mph)][1]
(Edit: I copied my bookmarked link which I've been using to see how much progress I've made locally)
[1]: http://www.itoworld.com/product/data/ito_map/main?view=5&bbox=103715.201723446,6761484.908928544,146367.063498934,6788934.515899256&layers=&base_style=&clear_map_history=true
Steve, you could try one of the ITO Maps to see if that shows what you are looking for?
e.g. [ITO - Map (Speed Limits mph)][1]
[1]: http://www.itoworld.com/product/data/ito_map/main?view=5&bbox=103715.201723446,6761484.908928544,146367.063498934,6788934.515899256&layers=&base_style=&clear_map_history=true