I wonder how well road projects scale in terms of length - if it would be better or worse per mile to have to do 50 or 500 miles of contiguous road vs 0.32 mile

I wonder how well road projects scale in terms of length - if it would be better or worse per mile to have to do 50 or 500 miles of contiguous road vs 0.32 miles. The absolute cost would be far higher of course but if it it scales slower than linear it suggests a consolidation process as more efficient or whatever the "peak efficency segment" may be.