Add remaining work from the roads refactoring.

TODO.md

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+# TODO
+
+## Roads
+
+turning circles for living streets
+turning circles for service
+widths for living streets
+highway area casing - should be wider
+highway area casing and fills should be variables
+tunnel casing widths
+tunnel fill widths
+motorway links are narrower than motorways (fair enough) but nothing else is (fix)
+service casing and fill widths
+pedestrian widths
+residential 10-13 width
+highway = road widths
+bridge casing widths
+paths etc widths
+paths etc colours
+railway colours
+paths etc tunnels
+track colours, width and dasharray
+track tunnels
+bridge casing
+bridge colour
+lowzoom widths
+tram width and colour
+guideways width and colour