Good afternoon everyone,

I am working on a project and could use some help. I have a line shapefile that I need to buffer. The trick is that I, ultimately, need the buffer to be exactly the width and length of a roads polygon layer, so that we can tabulate the area of road work that has been completed .  

Of course, I can buffer the line by a distance, say 10 feet, and the result is a polygon 10' wide and the length of the line feature.

I then need to go in and manually edit the vertices, adding new vertices as needed, to snap the buffered polygon to the exact dimensions of the roads polygon layer.

Does anyone know a way to tell the buffer tool to buffer to the dimensions of the road polygon, instead of a set distance?

I know that I can go in and change the buffer distance for each polygon, but with the varying dimensions for the roads poly, there is too much variability. 

I am really trying to find a quicker way to perform this work, without digitizing each piece of road poly that I need. 

Thank you all,

Jay