How would a series of highways across the country help in its defense?

you read about the Interstate Highway Act.
5-6 sentences

A series of highways across the country would help in defense in several ways. Firstly, it would enhance mobility and transportation capabilities for military forces and equipment, allowing for faster and more efficient deployments during times of conflict or national emergencies. Secondly, it would facilitate the movement of supplies, weapons, and troops to strategic locations across the country. In case of an attack on a region, a well-connected highway system would enable rapid reinforcements and response from neighboring areas. Additionally, highways would allow for the establishment of evacuation routes, effectively aiding in the relocation of civilians during a crisis or natural disaster. Lastly, a well-designed highway network could also serve as a deterrent by showcasing the nation's ability to quickly mobilize and defend itself, potentially deterring potential adversaries.