COMMON SENSE · 01 / A TRAFFIC EXPERIMENT
The jam is
a wave.
A small page about the strange, practical wisdom of traffic waves—and the possibility that one considerate driver can sometimes change the shape of a whole road.
02 / The starting point
Something I
noticed.
Years ago I found William J. Beaty’s little Traffic Waves site. It made an invisible traffic jam feel visible: not as a mysterious punishment, but as a moving pressure wave travelling backwards through a line of cars.
I tried taking that seriously while driving. Leave a little more space. Avoid the unnecessary brake. Don’t become the next sharp fluctuation in the flow. It did not turn every commute into enlightenment, but it changed what I looked for—and therefore changed how I drove.
Beaty’s original page is dated January 1998 and includes a 2008 account of experimenting with traffic flow on Seattle commutes. This page acknowledges that work and builds a new, deliberately modest experiment beside it.
03 / Our small model
Build a wave
and watch it travel.
A closed road is not a real motorway. It is a way to see that cars can keep moving while the disturbance moves the other way.
04 / The useful idea
Don’t be
the pebble.
A traffic wave can begin with an incident, a merge, a near miss, a rubbernecker—or an ordinary small change in speed. Once following drivers react too strongly, the disturbance can amplify. The visible jam then travels backwards even though the cars themselves travel forwards.
The practical lesson is not “drive strangely” or pretend a web animation is traffic engineering. It is simpler: smooth inputs matter. Looking further ahead, leaving room, and resisting needless acceleration and braking can be a small form of cooperation with people you will never meet.
This is the kind of common sense worth testing: ordinary, observable, and just complicated enough to reward attention.
05 / Acknowledgement and further reading
The inspiration for this page is Traffic Waves, created and maintained by William J. Beaty on the Science Hobbyist site. Read the original explanations, diagrams, experiments and links there. The oval simulator above is an original End Up Here sketch for thinking, not a reproduction of Beaty’s program and not a validated traffic model.
For a more technical route into the subject, Beaty’s page points readers towards traffic-flow research, jamitons, synchronized flow and jam-absorption driving.
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