I might be wrong in this. My understanding is that it is flammable, but not when it’s “solid” if that makes sense. That a fire would have to be on it and burning hot enough for long enough to start melting the tar then that could burn. But the asphalt itself isn’t likely to just catch fire from a lighting strike or something and just continue to burn.

First it melts, but it’s made up of very long hydrocarbons, so… probably?