[Batam Man]

Most taxi rides in and around Nagoya is still Rp.10k. They may ask for Rp.20k when they pick up a "tourist". Just ask about price before boarding a taxi, and most of the time the driver will take your Rp.10k if you stand firm.
But, if you are taking a taxi late at night from a nite spot, especially the discos, they may have to charge you Rp.20k or more. This is because the driver will have to pay the "security" a fee for picking up pasangers from that nite spot.