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Why are American semis 18 wheelers and Australian are 22 wheelers Login/Join 
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Everytime I see a movie etc. the American semis have two axles at rear of trailer and Australian are three axles. The prime movers look the same.
 
Posts: 7046 | Location: Sydney Australia | Registered: 14 September 2015Reply With Quote
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Some have 3 axles most have two goes way back to early trucking regulations and highway design.
 
Posts: 19317 | Location: wis | Registered: 21 April 2001Reply With Quote
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My guess would be load weight limits are less in the U.S. We don't have Road Trains like Y'all do either!


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Posts: 2247 | Location: Houston, TX. | Registered: 18 May 2004Reply With Quote
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Wow, you learn something new every day. . . . . Big Grin
 
Posts: 18517 | Registered: 04 April 2005Reply With Quote
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Now if you REALLY want to find out something historically interesting, look up why the current railroad rails are the distance they are from each other. It will surprise you unless you already know.


Never mistake motion for action.
 
Posts: 17357 | Location: Austin, Texas | Registered: 11 March 2013Reply With Quote
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Never even thought of something so simple as weight limit laws.
 
Posts: 7046 | Location: Sydney Australia | Registered: 14 September 2015Reply With Quote
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quote:
Originally posted by Mike McGuire:
Never even thought of something so simple as weight limit laws.


Frost heave in much of the country affects our roads. There are places where there are five seasons. The fifth season is called 'mud season'.


~Ann





 
Posts: 19127 | Location: The LOST Nation | Registered: 27 March 2001Reply With Quote
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We don't use no steenking chariots no more!


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Posts: 2247 | Location: Houston, TX. | Registered: 18 May 2004Reply With Quote
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Mike - In the US we have these things called railroads. Pretty much negates the need for road trains. Cool


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Posts: 22442 | Location: Occupying Little Minds Rent Free | Registered: 04 October 2012Reply With Quote
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quote:
Originally posted by Opus1:
Mike - In the US we have these things called railroads. Pretty much negates the need for road trains. Cool


Not much rail in outback Australia. A train goes from east cost across to Perth (capital of Western Australia) and another goes from Adelaide (capital of South Australia) to the top end.

Once you move well inland heaps of the roads that appear as "highways" are dirt roads.

A place where I shoot is all dirt for about 80 miles to very small town. Bills' properties are north west New South Wales so not real outback. Below are some of his semis. Click the photos tab to show more pictures of trucks.

https://www.trucksales.com.au/...harvest-fleet-59932/
 
Posts: 7046 | Location: Sydney Australia | Registered: 14 September 2015Reply With Quote
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I've passed a lot of those road trains. They'll give you a thrill.
 
Posts: 13760 | Location: Texas | Registered: 10 May 2002Reply With Quote
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Originally posted by Kensco:
I've passed a lot of those road trains. They'll give you a thrill.


We have semis with a trailer behind, called a B train. Is that the same thing ? Only allowed on certain multi lane roads.

Grizz


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Posts: 1577 | Location: Central Alberta, Canada | Registered: 20 July 2019Reply With Quote
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Well, Lee, you might be the only one here who knows the answer.


Never mistake motion for action.
 
Posts: 17357 | Location: Austin, Texas | Registered: 11 March 2013Reply With Quote
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quote:
Originally posted by Grizzly Adams1:
quote:
Originally posted by Kensco:
I've passed a lot of those road trains. They'll give you a thrill.


We have semis with a trailer behind, called a B train. Is that the same thing ? Only allowed on certain multi lane roads.

Grizz


The are called B Doubles in Australia. Seem to see them everywhere. Not sure but might not be able to use roads with a weight limit.

The road train is normally thought of as having 2 trailers or more in addition to the trailer hooked to the prime mover. Some are very big, a lot more than 2 trailers hooked to the trailer that is hooked to the prime mover.

Raod trains in Australia on a youtube

https://www.youtube.com/watch?v=0iFkKRh5kcM
 
Posts: 7046 | Location: Sydney Australia | Registered: 14 September 2015Reply With Quote
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quote:
Originally posted by Mike McGuire:
Everytime I see a movie etc. the American semis have two axles at rear of trailer and Australian are three axles. The prime movers look the same.


Well in the US it would depend on which state your in. I see plenty of three axle trailers where I live but two axle ones are still common too. So it would also effect how much weight you can carry.

105,000 gross where I live.


Roger
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Posts: 2787 | Location: Washington (wetside) | Registered: 08 February 2005Reply With Quote
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So it would also effect how much weight you can carry.


The federal limit is 34000 per standard two axle spread 80000 gross.

But the states often have special regulations that allow trucks to carry more.
 
Posts: 19317 | Location: wis | Registered: 21 April 2001Reply With Quote
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I'm interested because I do a lot of insurance coverage work in the trucking venue. Stop it with railroad. Two thirds of the goods in the US are transported by truck. Sounds like a GVW issue and I suspect the GVW in Australia must be higher than 80,000 lbs, necessitating an additional axle.
 
Posts: 9954 | Location: Houston, Texas | Registered: 26 December 2005Reply With Quote
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quote:
Originally posted by NormanConquest:
Now if you REALLY want to find out something historically interesting, look up why the current railroad rails are the distance they are from each other. It will surprise you unless you already know.


I will look that up. I’ve noticed the narrow tracks in Africa and Argentina and wondered why.


I meant to be DSC Member...bad typing skills.

Marcus Cady

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Posts: 3428 | Location: Dallas | Registered: 19 March 2008Reply With Quote
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quote:
Originally posted by NormanConquest:
Well, Lee, you might be the only one here who knows the answer.


Well the myth is Roman chariots but the right answer is what the English gentleman that first built rail lines there just decided on.

https://www.truthorfiction.com/railwidth/


Roger
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Posts: 2787 | Location: Washington (wetside) | Registered: 08 February 2005Reply With Quote
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Well, maybe so, maybe no. I'm sure there will be contestation about HWY I-35 that runs through Texas + beyond. It was built upon the wagon train tracks that separated East + West Texas + that trail, that in turn, was established by the buffalo herds in their migration.


Never mistake motion for action.
 
Posts: 17357 | Location: Austin, Texas | Registered: 11 March 2013Reply With Quote
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