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					Originally Posted by  CecilOne
					 
				 
				All rules require avoidance of collisions, but LL does or at least did have a "must slide" rule.   Of course, that is where many coaches started there "diamond" careers.   
The other part is that coaches teach players to slide to avoid tags & collisions; so then players think they must slide and that translates into a rule in their minds.   
It's like the turn after overrunning 1st base.  Players are taught to turn right to "avoid being out", that becomes a rule in their minds.  
And others, usually actually believed as rules by the coaches who have never been umpires. 
			
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 I've seen lots of tournaments and in-house leagues that have a must slide rule.  I don't think it's hard to see where the idea comes from at all.