(a) In this section:
(1) “Port authority” means a port authority or navigation district created or operating under § 52, Article III, or § 59, Article XVI, Texas Constitution.
(2) “Port of entry” has the meaning assigned by § 621.001.
(b) The transportation of a sealed intermodal shipping container under a permit issued under this subchapter:
(1) must begin or end at a port authority or port of entry that is located in a county contiguous to the Gulf of Mexico or a bay or inlet opening into the gulf; and
(2) may not exceed 30 miles from the port authority or port of entry and must be on a highway or road described by § 623.405(b).

(c) In addition to the requirements of Subsection (b), the intermodal shipping container must be continuously sealed from the point of origin to the point of destination with a seal that is required by:
(1) the United States Customs and Border Protection;
(2) the United States Food and Drug Administration; or
(3) federal law or regulation.
(d) A permit issued under this subchapter does not authorize the transportation of a material designated as of January 1, 2017, as a hazardous material by the United States secretary of transportation under 49 U.S.C. § 5103(a).
(e) A permit issued under this subchapter does not authorize the transportation of a sealed intermodal shipping container in a county that borders New Mexico and the United Mexican States.