Program applies only to SR 509 in SeaTac and SR 167 Expressway in Fife FIFE – Applications are now open for a new Low Income Discount Program providing qualifying drivers with a 50% discount on tolls for trips on the State Route 509 Expressway in SeaTac and SR 167 Expressway in Fife. To qualify, drivers must have a gross household income (before taxes) of no more than 200% of the Federal Poverty Level. For a single driver that would be an annual income of $31,920 or less; or $66,000 or less annually for