Science Hobbyist: Traffic Waves is one of those sites that could only exist on the old web. Written by Bill Beaty, a Seattle electrical engineer, sometime around 1998, it's a deeply personal, completely obsessive exploration of a single question: what actually causes those phantom traffic jams where you slow to a crawl, inch forward for ten minutes, and then suddenly everything clears up with no accident, no construction, nothing?
Bill's answer is brilliant and he explains it with such clarity that you'll never look at highway traffic the same way again. He asks you to imagine looking down from a helicopter, then walks you through simple diagrams showing how a brief stoppage creates a backward-moving wave of condensed cars. Even after the original cause is gone, the jam persists, creeping upstream like a living thing. He calls it a "crystalline amoeba" that poops your car out the front end. I love that.
But the real magic is on the experiments page. Bill describes how, stuck in stop-and-go traffic on SR 520 during his commute, he decided to just drive at the average speed of traffic instead of rushing forward and braking like everyone else. He let a big gap open up ahead of him. And then he looked in his rearview mirror. Behind him, for miles, the lane was smooth and uniform. No waves. No stop-and-go. In the adjacent lanes, he could count five or six clots of stopped cars. His single car had been "eating" the traffic waves. He writes: "Just one single 'lubricant atom' had a profound effect on the turbulent particle flow within miles of 'tube.'"
There's a whole page on zipper merging with side-by-side GIF animations showing the difference between packed-together drivers (slow, jammed) and drivers who maintain gaps and let people merge (faster, smoother). There's a massive FAQ where Bill patiently answers every skeptical objection you can think of. "Won't people just fill your gap?" "Aren't you just making traffic worse?" "What makes you such an expert?" His answer to that last one is honest and charming: "Nothing, I am not a traffic professional. I'm a double-E and science amateur."
The links page alone is a time capsule worth exploring. It's a huge hand-curated collection of traffic physics simulators, research papers, news articles, and videos, peppered with notes like "hilarious!" and "excellent!" next to his favorites. There's a link to a Bruno Bozzetto cartoon. A link to a "Traffic Dys-educational Film." A link to someone's page called "Gravel Pit Etiquette" that Bill marked as "excellent!" I clicked on way too many of these.
What got me was the comment book. People have been writing in for over twenty years, sharing their own experiments with Bill's techniques. A guy in LA talks about the satisfaction of watching aggressive drivers rush past him only to slam their brakes. Someone from Barcelona speculates about how automatic transmissions change the frequency of traffic waves. It feels like a little community built around one guy's obsession with seeing physics in his daily commute.
The whole site lives on amasci.com, which is Bill Beaty's larger "Science Hobbyist" homepage. And that place is its own rabbit hole. DIY infrared goggles for ten bucks. Hand-drawn holograms. Unwise microwave oven experiments. A page about childhood brain modification techniques (with a winking smiley). The man has been building this site since 1994 and it shows, in the best possible way. Every page feels like someone's actual brain, organized by curiosity rather than algorithm.
Go read the traffic waves page. Then try Bill's technique on your next commute. Then come back and tell me you didn't spend an hour clicking around the rest of amasci.com.