Click on the following to see some sample records,
mostly collected on Interstate 93 going North from Boston:
Flow instabilities are predicted by many models —
including “car following” models.
Interestingly, the otherwise sensible rule that, for safety reasons,
the separation between cars should be some multiple of the speed
(e.g. one car length per 10 mph), assures instability.
But more important here than explanations of why these instabilities
occur is whether — and how — they can be suppressed.
The answer is “yes” and the method is “bilateral
Click on the following for a set of slides with a brief explanation
of the problem and its solution:
Download and run the
Java will start and you will get the control panel shown above.
Click the “Start” button. Observe the instabilities develop (below, left)
Then check “Bilateral Control” and see the dissolution of those instabilities (below, right):
“Suppressing Traffic Flow Instabilities”
IEEE Intelligent Transportation Systems Conference (ITSC 2013)
Den Haag, Netherlands, 2013, October 6-9.