Louisville Metro Police say there may be a record crowd for Saturday's Thunder over Louisville airshow and fireworks display.Officials say mild weather and more families spending their leisure time closer to home could combine to attract more people to the waterfront this year."Come early and stay late. you're going to be down there possibly with 600-thousand, 700-thousand of your closest friends. they all want to enjoy the day and want to be home in 20 minutes. If you've got a helicopter that might be possible. Short of that, we devised a plan and we tweak it every year, for years, to arrive at the best way to get people in and out," Sweeney said.He says again this year, police will set up so-called express routes to move vehicles out of the area as quickly as possible after the show.More information about traffic routes and security rules is available here.