Practical uses for green laser pointers

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I know there are many practical uses for green lasers, this is just one of them I happened to find searching online that many people may not have heard about yet -

I found it doing a search on Youtube for green laser videos -

Snow plow alignment - there are actual dept of transportation snow plows that use green lasers to line up the plow blade to the edge of the road:

http://www.youtube.com/watch?v=IY87nIWsvGI