What Determines the Speed of Light Limit?

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Whyndham_UCL said:
c is a fundamental constant.
No, c is not a fundamental constant.

http://math.ucr.edu/home/baez/constants.html

To all: this thread has gotten out of hand and is full of misinformation. Please read the linked article. The value of c is entirely an artifact of your choice of units and has no physical significance; furthermore you cannot logically talk about the value of c independent of the units.

The only quantities which are independent of the units are dimensionless quantities, like the fine structure constant. I don't know why so many people seem resistant to this idea. Also, the dimensionless constants are the ones that contain the physics. See:

https://www.physicsforums.com/showpost.php?p=2011753&postcount=55
https://www.physicsforums.com/showpost.php?p=2015734&postcount=68

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