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What is a caravan called in the USA?
A trailer.
What is the purpose of primary air?
In an air-brake equipped vehicle, the primary air system supplies service braking pressure to the drive axles of the vehicle, and, if applicable, supplies service air to the trailer axles when the foot valve is used for braking.
Before the adoption of the constitution what were the states joined by?
The answer is the Articles of confederation. But, the person who just gave their answer, probably would get a headache just thinking about it while they're sitting in their trailer eating porkrinds because they don't care about academics, and clearly, their life is going nowhere! :)
Why would transporting goods by sea have been preferable to transportation over land?
Transportation over sea is generally less expensive and more direct. Furthermore, marine transport tends to be more energy efficient and safer than rail or road transport. A recent study (December 2007) by the Texas Transportation Institue, Center for Ports and Waterways (tti.tamu.edu). For instance, ton-miles traveled per gallon of fuel is 576 for barge; 413 for rail; and 155 for semi-tractor trailer. self-propelled vessels even beat the barge numbers. Furthermore, the ratio of highway and rail to inland marine fatalities is 155 to 22.7 to 1, respectively.
