The rule is the same for a car and a scooter, and it does not change because you have children in the back seat. Indonesia expects either a full Indonesian SIM (SIM A for a car, SIM C for a motorbike) or an International Driving Permit issued under the 1949 Geneva Convention, carried together with your home country license. Many tourist-market IDPs come from the newer 1968 Vienna Convention instead, and those are not the ones Indonesian police recognize, so it is worth checking which convention your home IDP was issued under before you rely on it.
If you are staying longer, say past your first year on a KITAS, plan to convert to a local SIM rather than keep renewing a permit. The process runs through the local Satpas licensing office and combines a medical certificate with a written and practical test. It is worth sorting out early, alongside the other paperwork on the first 30 days checklist, since getting an appointment and passing the test can take more than one visit.
Getting stopped without a valid license or IDP usually means an on the spot fine and sometimes a held vehicle until someone collects it, which is a bad afternoon with kids waiting in the heat. The bigger risk shows up after an accident: most vehicle and travel insurance policies will refuse to pay out if the driver did not hold a valid license at the time, leaving you to cover medical or repair costs yourself. That is one more reason to think through whether a car or scooter suits your family before you commit to one and the licensing that comes with it.
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