MP: 9.81
Location: 172nd St NE and SR 9, Snohomish Cty
Reassurance shield at the beginning of the route. SR 531 is one of only three “incorrectly” signed SRs in Washington that fail to adhere to the even-odd east-north scheme. The others are SR 523 and SR 548.
MP: 8.54
Location: 172nd St NE and 67th Ave E, Arlington
Reassurance shield as we pass near the Arlington Airport
 
MP: 6.63
Location: 172nd St NE and Smoky Point Blvd, Arlington
Little sign to stay straight and in the left lane for SR 531
MP: 6.49
Location: 172nd St NE and I-5, Arlington
JCT I-5. They covered up the control cities here and replaced them with lane information. Interesting.
MP: 6.32
Location: 172nd St NE and I-5, Arlington
But the “Seattle” still shows up for I-5 south
