How would I set a precise width of a road comprised of multiple edges? I have a road shrink-wrapped to a terrain created by using the OpenSteetMap add-on.

In object mode, the dimensions cover the entire range of the terrain that the road covers. The dimensions report the width and breadth of the road network on the terrain.

I would like to set the width of the road segments in the overall road network. 

Scale and Extrude don't seem to be the answer.  I have been going through a few books and on-line courses and have not found a solution.  

Is there a modifier or other transform that can be used to set the width of the one or more individual road segments in Edit mode?
My suggestion is to use a curve which will keep the segments of consistent size.

1.) Create the curve:



Create a plane for the road surface (although you could use a cube) and loop cut it multiple times (the more the merrier) and scale it out:


Add the Curve modifier to the plane and select the curve.  You can also scale it to the desired length:


Finally, use the MeasureIt addon (included with Blender) and proportional editing to get the segment the exact width you want.