WILMINGTON, Del. - (AP) -- Highway engineers say a crucial bridge on the Eastern Seaboard's interstate highway system could imperil drivers if traffic is allowed back on it. The bridge, near Wilmington, Delaware, was closed Monday when its support pillars were found to be tilting. The Interstate 495 bridge won't reopen anytime soon, highway officials said Tuesday, and the 90,000 vehicles that cross it every day are being diverted onto the main north highway, I-95, further overloading one of the most crowded arteries in America.