New York State Route 400 is a north-south highway in Western Erie County. It runs from Interstate 90/New York State Thruway, near West Seneca, to New York State Route 16, near South Wales. This is also known as the Aurora Expressway. NY St Rt 400 passes through the following towns in Erie County. West Seneca East Aurora NY St Rt 400 is multi-plexed in Erie County. New York State Route 16, at East Aurora. NY St Rt 400 intersects the following highways in Erie County. Interstate 90, (New York State Thruway) at West Seneca. U.S. Rt. 20, near West Seneca. New York State Route 78, near West Seneca. U.S. Rt. 20A, near East Aurora. New York State Route 78, near East Aurora. New York State Route 16, at East Aurora. New York State Route 16, near South Wales.
