In the US part of the reason for the Interstate system is for defense purposes. I believe that height of bridges somehow relates to what is needed for missiles

In the US part of the reason for the Interstate system is for defense purposes. I believe that height of bridges somehow relates to what is needed for missiles to travel underneath. https://www.fhwa.dot.gov/interstate/brainiacs/eisenhowerinterstate.cfm https://www.fhwa.dot.gov/interstate/brainiacs/eisenhowerinte... https://www.fhwa.dot.gov/infrastructure/50vertical.cfm https://www.fhwa.dot.gov/infrastructure/50vertical.cfm