Read all of RCW 46.61.425. It must be a road with one lane of traffic in each direction. That is not the case here, so it does not apply. You must also demonstrate that the officer's car was going less than the 40 mph speed limit. You have no evidence of that.

I can't help you with your other questions and will let more knowledgeable folks answer them.

And to Acai, a couple of year's ago my wife had a speeding ticket dismissed because of a mistake in the radar unit's serial number on the officer's report. So yes they do dismiss tickets when the mistake is significant.