Never heard about a road width icon... You want perhaps to use diverse kinds of roads. For that, go in the All Tool (hammer and pen icon), scroll down and choose the road you'd like depending on your drawing style. On the other hand if you draw road using line tool, you just have to change the line width. Hope it helps a bit...
If you are referring to the Change Width icon in CC2, it was placed in the right-click menu options under the "Change Properties" icon. I haven't seen or heard of a "Road Width" icon though.
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You want perhaps to use diverse kinds of roads. For that, go in the All Tool (hammer and pen icon), scroll down and choose the road you'd like depending on your drawing style.
On the other hand if you draw road using line tool, you just have to change the line width.
Hope it helps a bit...