How long is a B double?

A B double can be up to 26 metres long under NHVR regulations. The standard configuration is up to 25 metres, with the 26 metre limit applying when the distance from the front articulation point to the rear of the combination does not exceed 20.6 metres and the prime mover meets specific safety requirements including a front under-run protective device.

How to Get a B Double Licence in Australia TDT Training

Published: July 23, 2026

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Section 1 - Intro and Snippet

To drive a B double in Victoria you need an MC (Multi-Combination) licence from VicRoads - not an HC. This is the most common mistake people make when asking about a B double licence. An HC licence covers single semi-trailers only. The MC licence is what puts you behind the wheel of a B double, and to get it you need to already hold your HC and have at least 12 months of heavy vehicle licence history behind you.

TDT offers the MC licence course (TLILIC3018) in Victoria - the nationally recognised training that covers B doubles and all multi-combination vehicles. The course runs for one day and covers both the theory and practical assessment you need to apply for your VicRoads MC licence.

How to Get a B Double Licence in Australia (Victoria)

Hold a full car licence for 24 months - the starting point for any heavy vehicle upgrade in Victoria.
Get your HR licence via a TDT HR licence course and hold it for a minimum of 12 months.
Get your HC licence via a TDT HC licence course. You must hold a current HC before you can apply for MC.
Complete MC training (TLILIC3018) through a registered RTO such as TDT. One day of theory and practical, covering B double operation, load restraint, and reversing.
Pass the VicRoads assessment - skills test, on-road drive, and theory. Your RTO handles the assessment booking with VicRoads.
Apply for your MC licence through VicRoads. Your MC licence covers B doubles, road trains, and all multi-combination vehicles.

Section 2 - What Is a B Double

What Is a B Double Truck?

A B double is a prime mover coupled to two semi-trailers. The key feature is how the trailers connect - the lead trailer has a fifth wheel coupling built into its rear, and the second trailer sits directly on that coupling. There is no dolly, no drawbar, no extra axle group between them. That direct coupling is what makes it a B double and not an A double or a road train.

B doubles are the most common multi-trailer combination on Australian highways. There are estimated to be over 10,000 operating across the country every day. They first arrived in Western Australia and Victoria in the early 1980s, and by the mid-1990s every state had approved them. Under the NHVR classification, B doubles are Class 2 heavy vehicles.

Length

Up to 26 metres overall. Standard configuration up to 25 metres. The 26 metre limit requires the prime mover to meet specific safety standards including a front under-run protective device.

Mass

Maximum gross combination mass (GCM) of 68.5 tonnes. Axle mass limits apply per the NHVR Mass, Dimension and Loading Regulation.

Axles

7, 8, or 9 axles depending on configuration. Most standard B doubles on Australian highways run 8 or 9 axles.

Dimensions

Max height 4.3 metres. Max width 2.5 metres. These apply nationally unless a state condition is more restrictive.

B Double Is a Class 2 Vehicle Under National Law

The Heavy Vehicle National Law classifies B doubles as Class 2 restricted access vehicles. This means they can only travel on roads approved for their use under a gazette notice or individual NHVR permit. Check the NHVR National Network Map at maps.nhvr.gov.au before every run.

Section 3 - A Double vs B Double

A Double Truck vs B Double - What Is the Difference?

The difference is in how the second trailer connects to the first. On a B double, the second trailer sits directly on a fifth wheel coupling on the rear of the lead trailer. On an A double, the second trailer connects via a converter dolly - a separate axle group with a drawbar that acts like an extra set of wheels between the two trailers.

B doubles are shorter, more manoeuvrable, and more widely approved on Australian highways. A doubles are longer, carry more, and are mostly found in outback road train configurations in WA, NT, QLD, and SA.

Feature	B Double	A Double
Trailer connection	Fifth wheel coupling on lead trailer - no dolly	Converter dolly with drawbar between trailers
Max length	26 metres	Varies by state - typically up to 36.5 metres as part of a longer combination
Network access	Approved highways nationally under NHVR Class 2 notice	Mostly restricted to outback and regional routes under Class 3 or PBS
Common use	Interstate freight, FMCG, refrigerated, fuel, general freight on major highways	Bulk agriculture, livestock, outback freight in WA, NT, QLD, SA
Licence in Victoria	MC licence (VicRoads)	MC licence (VicRoads)
Commonality	Very common - over 10,000 on Australian roads daily	Less common - primarily remote/outback operations

B Double (Class 2)

Two semi-trailers, fifth wheel to fifth wheel. Up to 26m, 68.5t. Approved on most national highways. The standard combination for interstate and metro freight in Australia.

A Double (Class 3)

Lead trailer plus converter dolly plus second trailer. Up to 36.5m in a longer combination. Restricted to approved outback and regional routes. Common in WA, NT, and QLD bulk freight.

B Triple (Class 3)

Three semi-trailers connected fifth wheel to fifth wheel. Up to 36.5m. Requires NHVR permit. Common in WA grain and bulk freight. Needs MC licence plus PBS or permit approval.

Road Train

Any combination longer than 26m with multiple trailers. Requires Class 3 or PBS permit. Restricted to gazetted road train routes. Sign at front and rear required over 30m.

Section 4 - Licence Pathway

The Full Licence Pathway to Driving a B Double

There are no shortcuts on this pathway. Each step requires you to hold the previous licence before you can move on. The fastest possible timeline from a car licence to MC in Victoria is around two years - one year holding HR, then get HC, then book MC training.

Licence Pathway to B Double - Victoria

Car
Licence

Class C

Hold 24 months before HR

›

HR Licence

Hold minimum 12 months

›

HC Licence

Semi-trailers. Must hold before MC

›

MC Licence

B doubles, road trains

Each step must be completed in order. You cannot skip HR or HC. The MC licence covers B doubles and all multi-combination vehicles.

MC Licence Eligibility Requirements in Victoria

Requirement	Detail
Current HC licence	Must hold a current VicRoads Heavy Combination (HC) licence. No exceptions.
12 months heavy vehicle history	Must have held an HR or HC licence for a minimum of 12 months combined before applying for MC. If you got your HR and then went straight to HC, the HR time counts.
Eyesight requirements	Must meet VicRoads eyesight standards. A commercial driver medical may be required depending on your circumstances.
No current disqualification	Must not be currently disqualified from driving in Australia or subject to a Fines Victoria sanction.
LLND assessment	Some RTOs require a Language, Literacy, Numeracy and Digital assessment as part of the nationally recognised training pathway.

Section 5 - Costs

How Much Does a B Double Licence Cost?

The MC licence is just the final step - the full cost of getting to B double level includes every licence on the pathway. If you are starting from a car licence with no heavy vehicle experience, budget for the full pathway cost. If you already hold an HR licence, you are two steps away.

From $1,450

HR licence course
at TDT

Check TDT

HC licence course
at TDT - 1 day

Check TDT

MC licence course
at TDT - 1 day

VicRoads

Standard fee

VicRoads licence issue fee
paid through your RTO

Contact TDT directly for current HC and MC course pricing. Course fees do not include the VicRoads licence issue fee, which is paid separately on the day of assessment.

Already Hold HR? You Are Two Steps Away

If you already have your HR licence and have held it for at least 12 months, you can go straight to HC training and then MC. Many experienced HR drivers complete the HC and MC back to back with their employer's support. Ask TDT about the fastest pathway from your current licence class.

Section 6 - Victorian B Double Routes

Victorian B Double Routes - Where Can You Take a B Double?

B doubles in Victoria can only travel on roads approved for their use. The authoritative source for Victorian B double routes is the NHVR National Network Map, available at maps.nhvr.gov.au. The map uses a traffic light colour system - green for approved access, amber for conditional access, and red for restricted roads. The network is updated regularly and can change without notice.

B doubles travelling on the approved network under the National Class 2 B-double Authorisation Notice do not need an individual permit. If your route includes roads not on the approved network, you need to apply for an NHVR access permit before you travel. Rail and tram crossings in Victoria also require separate ODL crossing permits for vehicles over certain limits.

Always Check the Map Before You Travel

The Victorian B double network is subject to constant updates - roads can be suspended, amended, or added by NHVR notice at any time. Transport Victoria confirms that the National Network Map is the legally enforceable document. Never rely on a printed map or last week's route check. Go to maps.nhvr.gov.au before every run on an unfamiliar route.

Major Victorian B Double Corridors

These are the main freight corridors used by B double operators in Victoria. All are on the approved NHVR network but conditions and weight limits can vary. Check the map for current status.

Hume Freeway (M31)

Melbourne to Sydney. The busiest B double corridor in Australia. Approved for B doubles throughout. Major staging points at Wodonga, Albury, and Gundagai.

Princes Freeway / Highway (M1)

Melbourne to Adelaide via Geelong and Ballarat. Key corridor for South Australia freight. B double approved on freeway sections.

Calder Freeway / Highway (M79)

Melbourne to Bendigo and into the Mallee. Connects to the Sunraysia Highway for Mildura and NSW border freight.

Western Ring Road and Ring Roads

Approved B double access on sections of the Western Ring Road and metropolitan ring roads for port and distribution centre access. Check map for specific conditions.

Section 7 - What the Job Involves

What Does a B Double Driver Do?

B double driving is long-haul, high-responsibility work. You are managing 26 metres and up to 68.5 tonnes on Australian highways, often through the night, across multiple states, and under strict fatigue management requirements. The coupling, uncoupling, and manoeuvring of two trailers requires a level of skill and awareness that goes well beyond a single semi.

Most B double roles are interstate freight - Melbourne to Sydney, Melbourne to Adelaide, Melbourne to Brisbane - and involve a mix of highway driving, depot loading and unloading, and fatigue management under the Heavy Vehicle National Law. Many B double drivers keep a work diary for runs of more than 100km from their home base.

Common Duties of a B Double Driver

Pre-start inspection of the prime mover, lead trailer, and second trailer before each run
Coupling and uncoupling of trailers including fifth wheel checks, airlines, and electrical connections
Load restraint checks and compliance with the Load Restraint Guide before departure
Route planning using the NHVR network map to confirm B double access on all roads
Fatigue management and work diary maintenance for regulated interstate runs
Reversing the combination into loading docks, depot bays, and tight delivery areas
Managing vehicle dynamics on hills, curves, and in adverse weather with two trailers in train
Completing delivery documentation and chain of responsibility records throughout each run

Section 8 - Pay

How Much Do B Double Drivers Earn in Australia?

B double drivers earn well above the general truck driver average. The combination of MC licence, interstate driving, fatigue management compliance, and the skill involved in managing two trailers makes B double roles some of the better-paid driving jobs in the country. Night and weekend penalty rates under the Road Transport Award add to the base figures below.

Victoria average
Jora / SEEK data, 2026

$105,000/yr

NSW average
Jora / SEEK data, 2026

$110,000/yr

Melbourne roles
Jora / SEEK data, 2026

$120,000/yr

Source	Reported Figure	Notes
Jora - Victoria (2026)	$105,000/yr average	Based on SEEK job ad salary disclosures, last 3 months
Jora - Melbourne (2026)	$120,000/yr average	Melbourne-specific B double driver roles - includes some packages with super
Jora - NSW (2026)	$110,000/yr average	Based on SEEK job ad salary disclosures, last 3 months
SEEK (July 2026)	314 active B double listings	Strong national demand; VIC, NSW, QLD the main markets

Owner-Operators Earn More

B double owner-operators who run their own prime mover and trailers on regular freight contracts can earn significantly above the employed driver figures above. The upside comes with fuel, maintenance, insurance, and downtime costs to manage. Most successful owner-operators spend several years as employed drivers first to build route knowledge and freight contacts before going independent.

Section 9 - FAQ and Related

Frequently Asked Questions

In Victoria you need an MC (Multi-Combination) licence from VicRoads to drive a B double. An HC (Heavy Combination) licence covers single semi-trailers but does not cover B doubles. To get your MC licence you must already hold a current HC licence and have held an HR or HC licence for at least 12 months.

A B double is a prime mover towing two semi-trailers connected using fifth wheel couplings - with no dolly or drawbar between them. Under the NHVR classification, B doubles are Class 2 heavy vehicles. They can be up to 26 metres long, carry up to 68.5 tonnes gross, and have 7, 8, or 9 axles.

A B double can be up to 26 metres long under NHVR regulations. The standard configuration runs up to 25 metres, with the 26 metre limit applying when the prime mover meets specific safety requirements including a front under-run protective device. Height is limited to 4.3 metres and width to 2.5 metres.

A B double connects two semi-trailers directly using a fifth wheel coupling built into the rear of the lead trailer. An A double connects the second trailer to the lead trailer using a converter dolly - a separate axle group with a drawbar. B doubles are more common on Australian highways. A doubles are generally longer and are used in road train configurations on outback routes in WA, NT, QLD, and SA.

Victorian B double routes are managed by the NHVR and published on the NHVR National Network Map at maps.nhvr.gov.au. B doubles travelling on approved roads under the National Class 2 B-double Authorisation Notice can operate without a permit. Roads not shown on the network map require an individual NHVR permit. The network is updated regularly so check before you travel.

According to Jora (sourced from SEEK job ad data), the average B double driver salary in Victoria is $105,000 per year, with Melbourne-based roles averaging $120,000 per year. NSW averages $110,000 per year. Experienced interstate B double drivers and owner-operators can earn above these averages, particularly on refrigerated or time-sensitive freight contracts.

Keep Reading

The courses and guides that get you to B double level - and where to go next:

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Chris writes about trucking, logistics, and transport industry trends.

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