A proposed $220-250 million infrastructure bond could transform downtown traffic patterns ahead of a potential new Spurs arena, with plans that include a major interchange upgrade and expanded parking.

The traffic improvement plan, presented to City Council by Pape Dawson Engineering in June, outlines nearly 20 projects aimed at managing increased traffic flow around the proposed arena site.

A key feature includes a single-point urban interchange at Interstate 37 and Cesar Chavez Boulevard, which the engineers’ project would boost traffic flow by 60%, they said in the presentation.

“If there’s a new NBA arena, we’re going to need certain construction to be completed before or when it opens,” said Melissa Stendahl, president of the Lavaca Neighborhood Association, whose community would b

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