MP: 27.23
Location: SR 509 and S 128th St, Burien
Reassurance shield after the S 128th St exit
MP: 28.25
Location: S 112th St and SR 509, Seattle
Reassurance shield after the S 112th St exit
MP: 28.69
Location: SR 509 and SR 99, Seattle
JCT SR 99 coming up. There is a small physical gap between SR 509 N and SR 99 N, hence the “TO 99”
MP: 29.5
Location: SR 509 and SR 99, Seattle
Bear right for SR 99, both directions. SR 99 north exists after the gore and then loops back around onto this roadway.
MP: 29.5
Location: W Marginal Way S and 1st Ave S, Seattle
SR 99 North goes straight onto Marginal Way and then back on the previous roadway, SR 99 south heads to SR 599
MP: 29.56
Location: W Marginal Way S and 1st Ave S, Seattle
SR 509 ends here
