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In page Interstate Highway System:
"Parts of the Interstate System might have to be tolled in the future to meet maintenance and expansion demands, as has been done with adding toll HOV/HOT lanes in cities such as Atlanta, Dallas, and Los Angeles. Although part of the tolling is an effect of the SAFETEA‑LU act, which has put an emphasis on toll roads as a means to reduce congestion,[6][7] present federal law does not allow for a state to change a freeway section to a tolled section for all traffic.[citation needed]
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