EZ does it on MRT and Buses -- Pinoy Tech Blog - The Philippine%u2019s Premier Technology Blog another informative article by ka edong.
My how time flies. When I was in Singapore a couple of eons back this was still new. At that time they were using the same type of card that we use today at the MRT. The one which you need to insert into a card reading machine. But the infrastructure was already there. The same card can already be used on taxi's and buses. It was even used on devices mounted on cars which are automatically "transacted" on roads that require a toll fee (look ma no toll booths!). Currently in the Philippines, aside from the MRT's and LRT's, only a few Parking Lots are using this kind of technology.