Traffic in Highway 99 tunnel nearly matches last year’s viaduct use

Rush-hour traffic heads south into the Highway 99 tunnel on Monday. Traffic volumes in the tunnel are about the same as they were on the old viaduct.  (Mike Siegel / The Seattle Times)
Rush-hour traffic heads south into the Highway 99 tunnel on Monday. Traffic volumes in the tunnel are about the same as they were on the old viaduct. (Mike Siegel / The Seattle Times)

Traffic volumes have gradually increased since the tunnel's opening day on Feb. 4, to an average 74,900 weekday trips on May 6-10, according to the latest state data.

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