But then Sequim drivers would feel the need to go 5 or 10 mph slower than that  --  you could end up with stasis, or a whole road grid running ver-ry slo-o-owly in reverse.  

I say, set the speed limits in Sequim at about 35.  Then traffic will move at its proper speed of 25, at least between the universal mini-naps at the new improved traffic lights.  

There would be no net improvement in "downtown" Sequim, but  traffic might move pretty normally through Big Box Land  --  especially since no true Sequim driver slows or stops for anything in a roundabout.