Heavy traffic on the way to work yesterday, semi truck on the two lane road doing a consistant 45mph in the 55 zone. I was a couple miles behind him and had to stop completely a couple of times do to 'accordian effect'. I read a Civil War history that described the same thing in large columns of marching infantry, having to wait for guys in front to get going then having to double time just to keep up, only to come to a stop for no apparent reason a few minutes later. The fault could have been as minor as having to step over a fallen tree limb.

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51 willys M38
62 willys M38A1
79 chevy
92 300D
95 300D
96 vision recumbent
2004 Wrangler