Sydney - Sydney on Tuesday joined London, Singapore and other big cities in charging motorists for driving into the central business district (CBD) at peak times.
But the New South Wales state government is denying that a toll levied on cars coming over the famous Harbour Bridge into the city that varies according to the time of day is a congestion tax.
"This is not a congestion tax, it's nothing like a congestion tax, this is time-of-day tolling," Treasurer Eric Roozendaal said.