Do we really have to do 10 mph in Silverdale turn?

The in basket:  Peggy and Pat Tillery send an e-mail about a sign on westbound Highway 303 approaching the new urban interchange with Highway 3 in Silverdale, asking “Why is there a yellow 10 mph sign approaching the on-ramp when coming from Waaga Way, where you slow down to 35 and then get ready to head north on Highway 3 at that horrible interchange in Silverdale? 

“The on-ramp heading north on Highway 3 from that point,” their e-mail said, ” is tricky enough without having to slow down to 10 mph only to have to pick up speed to hit Highway 3 going north. Did they just forget to remove the sign when they constructed that area?”

The out basket: No, that is an advisory sign, suggesting a safe speed for making the turn onto the northbound on-ramp to Highway 3. It is not mandatory, as a black on white speed limit sign would be. It apparently anticipates a tall unstable vehicle that might tip over going faster than that. 

In a passenger car, I’ve found that going 10 miles per hour faster than any advisory speed sign I’ve ever encountered will get you through the turn or whatever the obstacle is safely. The 10 mph sign is an excess of caution that drivers of small vehicles normally can disregard.

But even if you choose to drop to 10 mph there, there’s lots of room on the on-ramp to get up to 60 mph for freeway driving, if your car is operating properly.  

2 thoughts on “Do we really have to do 10 mph in Silverdale turn?

  1. “… going 10 miles per hour faster than any advisory speed sign I’ve ever encountered will get you through the turn or whatever the obstacle is safely…”

    Ever encountered one of those signs while there was ice or snow on the road? Or heavy fog? Or after a few drinks?

    I hope the Rookies out there don’t believe everything they read…

  2. A ball-bank indicator is used to set curve advisory speeds. This is generally the nearest 5 mph speed that the indicator reads 10 degrees through the turn.

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