Cost of Building Highways

• $320k/mile for 4 lane highway - [1]
• $1M per mile for rural interstate highways, and $20M/mile for combined rural/urban average in 1996 - https://youtu.be/5-iDUcETjvo?t=2731http://www-pam.usc.edu/volume2/v2i1a3s2.html
• Maintenance costs are large - $500k per mile per year, compared to $1M per mile for construction - so maintenance costs as much as construction every 2 years? [2]