Roads made of coral is seen in #Guam #usa

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The United States territory of Guam has no railways or freeways, nor does it have a merchant marine. The largest port is Apra Harbor,[citation needed] which serves almost all commercial traffic including cruise, cargo and fishing vessels. There are smaller harbors located on the island (most notably one in Hagatna and one in Agat) which serve recreational boaters.

Roads are primarily paved by a coral/oil mixture that when it gets wet, the oil tends to float to the surface of the roads making them dangerous. This is one of the reasons the speed limit on most of the island is 35 mph.

Source: https://en.wikipedia.org/wiki/Transportation_in_Guam