Crossing the checkpoint is one thing — driving on into Malaysia is another set of rules again, from your licence to the PLUS highway tolls to whether your insurance even covers you there.
Most guides stop at the checkpoint. But if JB is a waypoint rather than the destination — a drive up to Melaka, Kuala Lumpur, or further — there's a second checklist that starts once you're through immigration, and it's not the same as the one for crossing. Here's what actually matters for driving in Malaysia, not just into it.
A Singapore driving licence is generally recognised for driving in Malaysia on a short visit, so most crossers don't strictly need an International Driving Permit (IDP) to drive their own car across for a trip. Carry the physical licence, not just the digital one. That said, an IDP is cheap belt-and-braces — some car rental companies in Malaysia ask for one, and it removes any ambiguity if you're stopped — so if you're renting a car or driving for an extended period, getting an IDP before you leave is the safer call than assuming your licence alone will do.
Two things you genuinely can't skip if you're driving your own Singapore-registered car:
Malaysian expressways run on pay-per-use tolls, paid by Touch 'n Go card, RFID, SmartTAG, or cash at some plazas — but not in the dedicated electronic lanes, so a topped-up TNG is what keeps you moving. The main artery north is the North–South Expressway (the PLUS highway), a well-maintained toll road running from Johor Bahru all the way up past Kuala Lumpur — roughly 350 km JB to KL. Tolls add up over that distance, so factor them into your TNG balance alongside the entry Road Charge, not as an afterthought.
Motor insurance is compulsory to drive in Malaysia, and this is the item most easily overlooked: your existing Singapore policy may or may not extend across the border. Some do automatically, some require you to add Malaysia coverage (often for a small extra premium), and some don't cover it at all. Check your own policy's territorial limits before you drive — a breakdown or accident in Malaysia on a policy that stops at the border is a genuinely bad place to discover the gap.
Don't forget the Singapore-side rule that catches drivers on the way out: the three-quarter tank rule. Your tank needs to be at least three-quarters full when you depart via a land checkpoint, checked on the Singapore side — a low tank can turn you around before your road trip even starts.