Port of Seattle here is a suggestion for SeaTac extra runway land on I-5

Hey Port of Seattle this has been a joke since the mid 1990's for SeaTac's extra runway.  Have them land on I-5 south of the Seattle city limits.  During the morning they can use the Southbound lanes and in the evening use the Northbound lanes.  Airlines would have to notify the DOT workers not to allow traffic on the highway during landing times.  You would not need to expand the airport.  It is well paid for already being used.  They just had to get transit bus to bring the passengers to the airport and to transport the luggage then taxi the plane to take up at a hanger going east on State Rte 518.