What were the positive effects of the interstate highway system? The positive effects of the interstate highway system were.

The interstate highway system, the largest public works program in history, has had an enormous impact on the nation. The interstate highway system has positively influenced economic growth, reduced traffic deaths and injuries, provided substantial benefits to users, and been a crucial factor in the nation's defense

Explanation:

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it would have concentrated power in the executive branch of the government. it would have restored balance among the three branches of government. it would have set a precedent for government intervention in the economy. it would have signaled an end to all the programs of roosevelt’s new deal.

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.