Just my personal observation, but I drive southbound through Bellevue each week either on Thursday night or Friday night around 6:00PM (I have every other Friday off, and usually it takes about 15-20 minutes on I-405 right as you get into Bellevue as you pass the 520 off ramp. The last 3 weeks is like a ghost town. The first night I experienced this I had to slow down because there was no traffic and I was doing 70 in a 60mph zone.
It’s weird. I Have a picture on my phone I could share if I knew how to post from that.
That is something, I live in SW Washington, and travel North quite a bit. Traffic has gotten so bad the last 20 years. Great time to commute.