Paul Bush, managing director of the 2027 Grand Depart, has said having the Tour De France in Lancashire was “massive for Lancashire”.
“We think there could be between 10 and 15 million people on the streets of the UK,” Bush told BBC Radio Lancashire.
Lancashire County Council said the economic impact could generate over £15m.
The route features a mix of fast sections and demanding climbs, including King of the Mountains ascents in the Trough of Bowland and over Rivington, plus an intermediate sprint to ramp up the pace.
Matt Townsend, director of highways and transport for Lancashire County Council, said the authority worked with the organisers to develop the route “to get the best of Lancashire”.
“This is one of the world’s biggest sporting events on our doorstep,” he said. “And we are at the heart of it.”
The county’s five climbs make it “an enormous part of stage two,” Jon Dutton, chief executive officer of British Cycling, said.