What are B doubles used for?
B-Doubles are one of the most popular classes of heavy haulage trailer combinations seen on Australia’s roads every day, but while they’re often confused for road trains they are not the same thing. It combines a prime mover attached to two semi-trailers, linked together by a fifth wheel.
What are B doubles?
B-double (plural B-doubles) (Australia) A truck and trailer combination consisting of a prime mover coupled to two trailers.
What is a super B-double?
A B-double is defined in the Heavy Vehicle National Law (HVNL) as a combination consisting of a prime mover towing two semitrailers, with the first semitrailer being attached directly to the prime mover by a fifth wheel coupling and the second semitrailer being mounted on the rear of the first semitrailer by a fifth …
What is a quad axle group?
A quad axle group means a group of four axles in which the horizontal distance between the centre-lines of the end axles is between 3.2 and 4.9 metres. Quad-axle group masses. Quad-axle groups have the following masses under. General Mass Limits (GML): Quad-axle group description.
What’s the difference between a double and B-double?
A B-type trailer is one with a fifth-wheel coupling, be it a turntable or a greased plate. A Type One double road train has a B-coupled trailer pulling an A-coupled trailer and a Type Two triple road train has a B-coupled trailer pulling two A-coupled trailers.
What is the difference between an A double and a B-double?
B-Double – The B-Double or B-Train is often confused with being a road train. It is made up of a prime mover which pulls two semi-trailers, which are linked by a fifth wheel and can be up to 26 metres long. Double Road Train – a double road train consists of a prime mover, a semi-trailer and a five axle dog trailer.
What is the maximum allowable width of a B-double?
for a B-double—25 metres. for a road train—53.5 metres. for a car carrier —25 metres. for an articulated bus—18 metres.
When did B doubles start in Australia?
The famous Aussie road train was born back in 1945 when the late great Kurt Johannsen used an old US Army tank transporter and as many trailers as he could hook up to move livestock across the red centre.
How much weight can a quad axle hold?
The average quad-axle dump truck is limited to about 17 tons of payload each trip, in compliance with the federal bridge law, as well as most state bridge laws. A Super Dump, however, hauls up to 26 Tons of payload each trip.
How much weight can a quad axle trailer hold?
46,725 pounds with 4′-6” axle spacing, 8-foot width, 4 tires per axle. 58,406 pounds with 4′-6” axle spacing, 10-foot width, 8 tires per axle. 60,000 pounds with a minimum with a minimum 5′-9” axle spacing, 10-foot width, 8 tires per axle.
Does America have B doubles?
It may also be known as a B-train, interlink in South Africa, B-double in Australia, tandem tractor-trailer, tandem rig or double in North America. They may typically be up to 27.5 m (90 ft 3 in) long. In North America this area of the lead trailer is often referred to as the “bridge”.
What is B train truck?
B-Trains are a truck-trailer combination where the axles of the lead trailer stick out and a fifth wheel is mounted on the lead trailer. The 8 axle, 63,500 kg B Train is standard across Canada. A set of two can be pulled to a destination. Popular for hauling flatbed, bulk and liquid goods in Canada and some US states.
How big can A B double quad axle be?
Quad-axle B-double B-double combinations can be configured to carry the equivalent of two 40 foot containers, with a gross combination mass of up to: 72.5 tonnes (or 73.0 tonnes) if one quad-axle group is fitted 77.0 tonnes (or 77.5 tonnes) if two quad-axle groups are fitted.
How big is a quad axle group trailer?
A quad-axle group semi-trailer can have a gross combination mass of up to 50.5 tonnes, with a quad-axle group load of 27 tonnes. ‘Blueprint’ designs for quad-axle semi-trailer and B-Double combinations were PBS approved some years ago and operators can use them to specify combinations that can have access on PBS networks.
What’s the maximum axle group for a quad axle semi?
Proposed maximum axle group loads are: quad axle group – 27 tonnes. ‘Blueprint’ designs for quad-axle semi-trailers and B-doubles have been pre-approved to Performance Based Standards and made available to the heavy vehicle industry. Operators can use these ‘blueprints’ to apply for access on PBS networks.
How big can A B double truck be?
B-double combinations can be configured to carry the equivalent of two 40 foot containers, with a gross combination mass of up to: 77.0 tonnes (or 77.5 tonnes) if two quad-axle groups are fitted. Proposed maximum axle group loads are: quad axle group – 27 tonnes.