HTUAHigh Threat Urban Area (US TSA)
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It subsumes most TIH material transportation regulation within HTUA and requires shippers and receivers to bear most of the regulatory burden, while at the same time shielding railroad carriers.
The TSA Rule addresses state attempts to enact regulations heightening a railroad's burden of securing rail facilities within HTUAs (and a ten mile extension thereof).
Whatever technology companies use, it must be capable of giving location data quickly, and at shorter intervals when cars are in HTUAs.
The unit can be set to send location messages at any time and at chosen intervals based on location, such as in HTUAs.
cities that are not considered HTUAs and, consequently, are not included on the list.