They wanted the roads for their Army, just like the US Interstate system was originally created in case the Army needed to be moved across the country very quickly if the Soviets attacked.

只关注军队用路，就好像美国州际公路系统,原本是为了苏联攻击时,陆军能快速穿越国家而建的。

耶鲁公开课 - 新约课程节选

People who are not doing anything are deemed to be affecting interstate commerce by their very inaction.

FORBES: Obamacare Insurance Mandate - Another Circuit Heard From

But the nature of war appears to be changing, as interstate conflict has become rare to the point of extinction, leaving violent clashes in which civilians are particularly vulnerable.

ECONOMIST: Civilians in conflict

Gasoline was not to be found along the interstate and cars that ran dry made the gridlock even worse.

NPR: Gridlock Hampers Texas Evacuation Efforts