True or False: TEA-21 built upon the initiatives established in the ISTEA.

Answer: A — True

The statement is true because TEA-21, which stands for the Transportation Equity Act for the 21st Century, directly built upon the initiatives and concepts laid out in its predecessor, ISTEA (Intermodal Surface Transportation Efficiency Act). ISTEA introduced significant reforms to transportation planning and funding, focusing on a more holistic and integrative approach to transportation systems. TEA-21 took these principles further by expanding funding for surface transportation and emphasizing multimodal solutions, safety, and environmental considerations. This continuation and expansion of ISTEA's goals demonstrate a direct relationship between the two legislations, confirming that TEA-21 was indeed an evolution of the framework established by ISTEA.