Here’s how the Highway 99 tunnel will shake up your travel routine

The north portal of the new Highway 99 tunnel shows the entry to the southbound lanes under Harrison Street. The Space Needle is at right. (Mike Siegel / The Seattle Times)
The north portal of the new Highway 99 tunnel shows the entry to the southbound lanes under Harrison Street. The Space Needle is at right. (Mike Siegel / The Seattle Times)

On Monday, the longest (two miles) and widest (53 1/3 feet) multilane tunnel in North America opens to traffic under downtown Seattle. It will upend traffic patterns across the city center.

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