Police focus on traffic, security for Wallenda weekend.

Byline: Nancy A. Fischer

June 12--NIAGARA FALLS -- There's no simple formula for dealing with the tens of thousands of tourists expected to pour into the area to view Nik Wallenda's high-wire walk Friday over Niagara Falls. No one has ever attempted a feat like this in recent history, and public-safety authorities never have had to deal with as large a crowd, with officials expecting up to 150,000 people. Authorities say security will be tight. Niagara Falls Police Superintendent John R. Chella said city police will be joined by federal agents from the FBI, Border Patrol, Customs and Transportation Security Administration, as well as New York State Police, State Parks Police and the Niagara County Sheriff's Office. …