Uber took down the taxi industry and now it wants a piece of public transit. That has transportation and urban planning experts deeply worried.

For years, as it aggressively entered new markets, Uber has maintained that it is a complement and ally of public transit. But that messaging changed earlier this month, when Uber released its S-1 ahead of its upcoming initial public offering.

In the regulatory filing, Uber said its growth depends on better competing with public transportation, which it identifies as a $1 trillion market it can grab a share of over the long-term.

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