Driving through San Mateo (Rizal province) this morning I spotted a tricycle with seven people on it. That's not the most I have seen on one tricycle, but this is the most I have seen when I have had my camera to hand. (I once saw in Vietnam seven people on just a motorcycle).
I wonder if there are supposed to be any regulations about the number of people a tricycle is allowed carry? And if the driver has more than the three passengers that the tricycle is designed for, does he give them a discount if he carries twice that number?
The answers are probably yes and probably no, but this is the Philippines, so I doubt anyone is going to worry about details like that. At least it's an efficient way of moving people around – albeit not quite up to western safety standards for public transport.