This sign says to not enter the beach in a motorized vehicle because sea turtles are nesting. We saw a couple of Americans parked on the other side of this sign, fishing, and their tire tracks ran directly over a freshly laid sea turtle nest.
link:
https://techlawforum.wordpress.com/2014/09/28/an-explanation-of-bitcoins-part-ii-the-technology/10880144944_fa773eb731_o/