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Crash data and concerns from area residents led to WSDOT implementing the new limit.
The work is part of a regional pavement preservation project designed to extend the life of highways across northwest Washington.
Historically, gas prices ease after the summer travel season comes to an end.
The accompanying levy will cost $52 per year for the owner of a $600,000 home.
One of the accidents is being investigated as a suspected DUI.
Gas prices are moving higher across Washington, even as oil prices show signs that future increases could slow.
A full closure of Hwy 9 east of Mount Vernon is scheduled to begin August 12.
E Badger Road will be reduced to one lane as crews finish work on the site.
The average price at the pump in the county sits at $4.80 per gallon as of Monday.
The new 109-space lot is located next near the intersection of Granary and Roeder Avenues.