Traffic lights extruder

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The traffic lights extruder is a growing pattern constructed by Jason Summers in October 2006, which slowly creates an outward-growing chain of traffic lights. The growth occurs in waves which travel through the chain from one end to the other. It can be thought of as a complex fencepost for a wick that does not need a wickstretcher.

The following illustrates a series of traffic jam reactions, in which a newly created traffic light at the left eventually pushes the rightmost one slightly to the right.

x = 51, y = 9, rule = B3/S23 22bo23bo$22bo23bo$9b3o10bo10b3o10bo$b2o$3o4bo5bo4b3o3b3o4bo5bo4b3o3b3o $b2o4bo5bo17bo5bo$7bo5bo8bo8bo5bo8bo$22bo23bo$9b3o10bo10b3o10bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 GRID THEME 6 GPS 20 LOOP 140 ZOOM 12 PAUSE 2 AUTOSTART WIDTH 800 ]]
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RLE: here Plaintext: here

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