Hogg's Hollow Bridge

Hogg's Hollow Bridge, originally known as the Yonge Boulevard Viaduct, is a set of four separate highway bridges that span the Don River Valley in Toronto, Ontario and carries 14 lanes of Highway 401. The four structures are the busiest multi-span bridge crossing in North America, surpassing the Brooklyn Bridge. The Hogg's Hollow Bridge has a 14-lane cross section: 6 collector lanes, 8 express lanes. The road surface and bridge decks require constant maintenance due to the wear and tear from high traffic volumes. Since 2001, an Ontario tall-wall concrete barrier has replaced the steel guiderail in the median separating eastbound and westbound traffic. The late 1960s conventional truss lights have been replaced by high-mast lighting....