While I agree with you about the preference to ship things by rail, the fact has to be faced that the majority of places in Australia have no railway line to them - and most places where road trains are allowed have no rail service. The city based governments in most states have for many years closed non-urban railways wherever possible, often by running them down until the cost of making them safe becomes prohibitive. The reasons for this are simply that road transport is cheaper, because the infrastructure is shared among more users, and it lends itself less to the abuse of monopoly power, which was used by both unions and government railway owners to drive traffic onto the roads from WW2 onwards (although that wasn't their intention). Many main lines that do have heavy freight traffic are either close to or at saturation without significant investment.
As far as stopping large vehicles goes, I do not know of any laws of physics that make a multi-trailer vehicle harder to stop than a single trailer vehicle - since the axle loading is legally limited, every increase in mass is accompanied by a proportionate increase in braking capability. Although trucks do not in general have as good a brakes as typical cars, there is no reason why stopping distance should have any relation to the mass being stopped - the ultimate limit is tyre adhesion, and the mass that needs to be stopped is the same as the mass loading the tyre. Do you expect your Discovery at around three tonnes loaded to take longer to stop than a Honda Jazz or similar at a third the mass? In fact, I suspect that a modern B-double with ABS brakes can outbrake many cars on the road, although the brake's heat dissipation will not be as good as most cars, so they will avoid prolonged braking.
As far as being a moving bomb, the difference between one tanker and several is probably pretty irrelevant once you have an accident.
Certainly there is a problem with telling what is wrong further back - but not significantly worse than with a single trailer, and it is worth noting that truck fires are often the result of unnoticed flat tyres on the trailer!
I don't like trucks on the road either - but voters have for many years voted for governments that put them there, and in any case for most places in Australia, there is no alternative.
John


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