The Secretary shall require motor carriers that have a hazardous material safety permit under part 385 of title
49, Code of Federal Regulations, to maintain, follow, and carry a route plan, in written or electronic format, that meets the requirements of section
397.101 of that title when transporting the type and quantity of hazardous materials described in section
385.403 if the Secretary determines, under the assessment required in subsection (b), that such a requirement would enhance security and safety without imposing unreasonable costs or burdens upon motor carriers.