Driving near road trains Australia: what campervan travellers need to know

A road train is a prime mover hauling multiple trailers, common on long freight, cattle and mining routes where towns are hundreds of kilometres apart. In the Northern Territory, outback WA, western Queensland and northern SA, triples up to about 53.5 metres are part of normal highway life. Some are longer under permit on private or remote roads, but your campervan should not be there unless the hire agreement and road conditions clearly allow it.

The first one usually arrives without drama: a shimmer ahead, then three trailers of cattle, fuel or groceries pushing a wall of air past your mirrors. Most are travelling at up to 100 km/h on open highways. They are professional drivers doing a hard job; the trick is not to surprise them.

• Do: keep left, headlights on in daylight, and maintain a steady speed.
• Do not: wander over the centreline while gawking at the red dirt like a tourist in a hat shop.
• Expect them on: the Stuart Highway, Barkly Highway, Great Northern Highway, Flinders Highway and Nullarbor freight routes.

If a road train comes up behind you, your job is simple: be predictable. A 6-berth motorhome can be 7 metres long and 3.2 metres high, which means it catches wind and moves more than a sedan. Do not brake suddenly, do not drift onto a soft shoulder, and do not speed up because your pride has woken up.

On a straight section, the truck driver will choose their moment. Ease off slightly only when it is safe and obvious they are committed to passing. Once the first trailer is beside you, hold the steering wheel firmly; the air pulse can nudge a high-sided camper.

• Do: sit on a steady, legal speed and create space once the cab is past.
• Do not: pull half onto gravel at 90 km/h; soft edges can grab a tyre and ruin your holiday faster than warm cask wine.
• Gap afterwards: leave at least 200 metres so stones, spray and dust are not thrown straight into your windscreen.

Passing 53.5 metres of truck is not like nipping around a caravan near the bottle-o. At 100 km/h you are covering 27.8 metres every second, and you need room to accelerate, clear the truck, and return safely without cutting in. In a loaded campervan, especially into a headwind, you may need 1.5 to 2 kilometres of clear, flat road to make a clean pass.

If there is dust, a crest, a floodway, a bend, wildlife, or any doubt, stay behind. The outback has a way of hiding oncoming vehicles in heat haze until they are suddenly very real. Five minutes lost is better than explaining to your travel insurer why you tried to drag-race a triple.

• Do: wait for a long straight, good visibility and a proper passing lane if possible.
• Do not: overtake in dust, near cattle grids, over crests, or when your van is already working hard.
• Useful tool: a handheld UHF on channel 40 can help you hear truck chatter, but it does not replace your eyes or the road rules.

On sealed highways, stay on your side and hold the van steady. If the bitumen is narrow, slow down early but keep your wheels on the sealed surface unless there is a wide, firm shoulder. Dropping one side onto loose gravel as a road train passes can pull the camper sideways, especially if the shoulder is corrugated or wet.

On unsealed roads, the safest move is usually to slow down, pull well off the road where firm and safe, stop, and let the road train pass before rejoining. Then wait for the dust cloud to clear. Many hire campervan agreements restrict or exclude unsealed roads, night driving, beach driving and flood-damaged roads, so read the conditions before you get ambitious with a dotted line on the map.

• Do: reduce speed before the truck reaches you, not during the air blast.
• Do not: drive blind through bulldust just because the GPS says the campground is only 18 km away.
• Wet season note: in the Top End and Gulf country, roads can close quickly after storms from November to April.

Roadhouse caravan parks are not glamorous, but they are gold for self-drivers: fuel, water, toilets, hot showers, meals, bins and often powered sites in the same dusty compound. They also put you near the highway without forcing you to sleep in a truck bay, which is poor form and sometimes dangerous.

Rest areas and free camps vary by state and council. Some allow 24-hour stops; others are day-use only or ban camping outright. National parks usually require booking before you arrive, and many remote parks have no bins, no drinking water and no dump point. If your van has a toilet, plan dump points every few days rather than treating the nearest long-drop like a portal to freedom.

• Do: park away from truck-only bays and leave wide turning room for B-doubles and triples.
• Do not: roll out the awning into a traffic lane at a roadhouse camp, even if it is the only shade for 300 km.
• Good habit: arrive before dusk; roos, cattle and fatigue all become worse after dark.

A typical hire campervan or small motorhome may use roughly 12 to 16 L/100 km, and more in headwinds, heat or hilly country. With a 75-litre tank, a sensible planning range might be 450 to 550 km, not the optimistic number you get while parked at the servo. On the Barkly, Nullarbor and Pilbara routes, fuel stops can be 180 to 370 km apart, and some close early.

Outback heat is not decorative. Summer temperatures can sit above 40°C, tyres run hotter, fridges work harder and water disappears at an alarming rate. Carry at least 5 litres of drinking water per person per day, plus extra for delays, and fill the fresh-water tank whenever you are sure the source is potable.

• Do: refuel at half a tank in remote country and check tyre pressures cold in the morning.
• Do not: rely on one app, one card, or one nearly-empty LPG bottle when the next town is a long, flat rumour.
• Before you book: check availability online for a van size that suits your route, luggage, beds and remote-road restrictions.