Which action did TEA-21 NOT take regarding transportation safety?

Answer: D — Set standards for roadside inspections

The action that TEA-21 did not take regarding transportation safety pertains to setting standards for roadside inspections. TEA-21, or the Transportation Equity Act for the 21st Century, primarily focused on improving transportation funding, safety programs, and efficiency. While it aimed to enhance safety overall, including increasing safety belt usage and promoting lower blood alcohol content for drivers, specific standards for roadside inspections were not a direct focus of the Act. Roadside inspections have more traditionally been governed by regulations from the Federal Motor Carrier Safety Administration and other entities rather than being specifically established by TEA-21. This distinction highlights that while TEA-21 contributed to overall safety improvements, it did not directly address the regulatory framework for roadside inspections.