Hardly,
Decades ago, Oregon had a "Basic Speed Rule" where you drive at a speed safe for conditions. That is why signs in Oregon say "Speed" rather than "Speed limit". So on a clear sunny day with light traffic you could argue 70 is safe for the conditions. Conversely, if you drive 55 in a 55 speed zone during a snowstorm, without a traction device of some sorts in traffic, you could get a ticket.
This law has been replaced by stricter legislation, eliminating the judge's ability to reduce a fine set by the officer.
I think the overall message sent is that people don't know how to drive according to the conditions (traffic or weather).
Legislation can not replace common sense.