I suggest you...consider a new form of supplemental highways which are safer, faster, more economical to use and to build, use less space than a single lane highway. A single lane can transit over 15,000 vehicles per hour 120 miles, all electric, no oil, hand free, fully automated, called bimodal glideways and it will transform all transportation systems, an ecological and economic boom for the US. See video and data at "bimodalglideways.com" thank you, bill davis
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