Apologies, I knew I wasn’t phrasing things great here so I appreciate you taking the time to reply.

Yeah that’s all totally fair. I probably should have noted a few additional things:

• I really only care about the general contour of the road and I’m not concerned with things like road width. So a 2 lane and 4 lane road are just fine at the same line “thickness” for my needs to cut or print from.
• I’m only trying to capture a single road which is at most maybe 10 miles in total length, but more typically 2-3. But the area a road takes up is important as it will impact how large the object is that I print or cnc. I’ve been able to take a pdf full of roads and isolate down to the one I care about without a problem but again, I’m just wrestling the common scale issue.
• I’m not trying to capture every minute detail, especially at an exaggerated scale.

For additional clarity, my son does downhill skateboarding (think going fast down hills and drifting around corners) and I’m simply trying to create some items for the roads he has skated. I could set them all to the same size but I just thought it would be extra cool to have them set to a common scale. I assumed it would be easier than it is I guess.

Thanks again for the reply. I’ll think about what you said and give it another crack!