It's in the NTP i shared it in the GDP thread. It says they all agreed on how to split the revenue and how much each member state would pay into national tax.
I skimmed through it again and i don't think it mentions Mobile money tax directly. I think they all are starting off with it locally and then scaling in nationally later, that's what i'm assuming
They make the distinction between high volume or low volume, meaning how much traffic they carry. Its the city roads they called low volume, the high volume are like the highways.
It's bitumen not asphalt concrete or tarmac. You see the black thing? Thats what that is
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A better look, but its used as a surface dressing on top of paved roads/worned down roads or bitumen is mixed with aggregates (stones and sand) to make asphalt concrete. These asphalt layers form the actual pavement structure of the road. This is used when building new bituminous roads from the ground up.