This seems to be a simple question with a simple answer. And the answer is no. While the Philippines is signatory and has ratified the Vienna Convention on Road Traffic and the Vienna Convention on Road Signs, the United States hasn’t. The US also depends on their Manual of Unified Traffic Control Devices (MUTCD) that is by their Federal Highway Administration (FHWA).

Here is a nice article on Wikipedia for a comparison of signs in different countries:

https://en.wikipedia.org/wiki/Comparison_of_traffic_signs_in_English-speaking_countries

I recall an interesting project I was involved in where we audited signs along what was a new Subic Clark Tarlac Expressway (SCTEX). The signs from Clark to Subic followed international convention while the ones from Clark to Tarlac followed the MUTCD. We recommended that the latter signs be changed to international convention. I am not sure if the tollway operator changed the signs as I recall there were still US standard signs there particularly for speed limits.

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