Demolition of the 60-year-old Alaskan Way Viaduct began at 8:38 p.m. Friday night.

Crews were running about a half-hour behind schedule. But once the work began, crews were on a strict deadline and they'll be working around-the-clock for the next nine days.

An estimated 110,000 drivers use the Viaduct every day and they'll be navigating for alternate routes. For drivers, it's likely to be a nightmare, but for the Washington State Department of Transportation (WSDOT), it's historic.

"We will basically cut a hole in the existing viaduct for new roadway to go through and allow train traffic to travel underneath the Viaduct," Travis Phelps said.

The new roadway will have wider lanes and will be built to current earthquake standards.

Demolition will occur from 7am-10pm. The clearing out of the rebar and concrete will happen overnight. Once the rebar and concrete are removed, crews will focus on the upper deck. Due to logistics, crews can't demo the top deck and keep traffic moving.

WSDOT asks that drivers start planning alternate routes.