C.M. GUERRERO / EL NUEVO HERALD FILE
This 2013 file photo shows the State Road 836 eastbound toll plaza.
A local agency that defied opponents by setting new tolls for Miami-Dade County’s busy Dolphin Expressway is caught in the crosshairs of the Florida Legislature.Two South Florida lawmakers want to reshape the Miami-Dade Expressway Authority, better known as MDX, and require the county commission to sign off on toll hikes. The Senate version (SB 772) won the approval of the Senate Transportation Committee in a tense 6-4 vote Thursday.