Cortlandville, N.Y. — A jack-knifed tractor-trailer has shut down all lanes of Interstate 81 north near Exit 54 in Cortland County early Tuesday, according to state officials.Around 6:09 a.m., the crash occurred near Exit 54, formerly Exit 12, which serves Route 11 and Routes 41 and 281 for Cortla nd and Homer, according to 511NY. ...read more read less