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In page Santiago Tianguistenco:

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In the early 21st century, a major section of the highway linking Santa Cruz Atizapan and Santiago Tianguistenco was opened to alleviate chronic traffic problems in the area. This section is part of a large highway built to link western Mexico City with the state of Morelos. Prior to its construction, traffic was distributed among the many local roads.[5] Another highway connection Tianguistenco with Lerma, called Lerma-Tres Marias, has been held up due to environmental concerns.[6]