Which of the following is true of routing regulations?

Routing regulations are governed by both federal and state laws. According to CLT 4.0, while the federal government defines the National Network for heavy vehicles under the Surface Transportation Assistance Act (STAA),states primarily regulate HAZMAT routing. States determine specific permissible and restricted routes for hazardous materials based on population density, infrastructure, and emergency response capacity. This allows for greater safety control at the local level. Federal regulations set broad vehicle size, weight, and interstate standards, but hazardous cargo routing—such as explosives, flammable liquids, or radioactive materials—is state-controlled. Logistics professionals must verify route compliance before transport to avoid violations or safety risks.