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In this video, at the 6:25 mark, you can see a truck drive in front of the crawler, spraying water on the gravel ahead of the treads. Why did they do this?

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    $\begingroup$ Drifting is easier on a slippery surface. $\endgroup$ – ceejayoz Jun 26 at 20:11
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According to https://www.popularmechanics.com/space/rockets/a15777930/launching-to-space-at-a-crawl/
it is to reduce dust created as the crawler crushes some of the "Alabama River Rock".

Photo showing the crushed rock behind the crawler. enter image description here (Source - Organic Marble)

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    $\begingroup$ Is "reduce dust" ever not the reason to spray water on a gravel road? $\endgroup$ – RonJohn Jun 26 at 14:26
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    $\begingroup$ @RonJohn, perhaps "prevent sparking" could be a reason, but in this case the specific type of rock was chosen to prevent sparking. Don't know where in the world sparking on a gravel road might happen. $\endgroup$ – NeutronStar Jun 26 at 17:49
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    $\begingroup$ This is a good reminder that this crawler is insanely heavy. It is listed as weighing 6 million pounds (~2.7 million kgs) $\endgroup$ – Kevin Wells Jun 26 at 18:01
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    $\begingroup$ @NeutronStar quartz is piezoelectric and produces electric sparks when quartz pebbles are rubbed/banged together. In some places quartz is a common component of gravel. $\endgroup$ – Skyler Jun 26 at 18:16
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    $\begingroup$ @NeutronStar: Around here (NW Oregon), most gravels spark slightly when driven over since they consist of basalt which is about 50% silica. $\endgroup$ – wallyk Jun 26 at 22:04

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