Speed is controlled by the ECU.
Assuming you're referring to the speed governor, it's programmed into the motor's ECM.
Trucks in the UK are limited to 50mph on public roads, however on racing circuits and with the engine governor removed and no load to pull racing trucks can exceed 100mph.
You can purchase used trucks internationally from websites such as Truck Paper. Alternatively, you can also purchase these trucks from the International Used Trucks website.
Trucks are used for carrying supplies and to just drive.
You can find used trucks online at www.autotrader.com.
Used trucks retain their values compared with that of cars. Trucks do depreciate in value though.
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On the fuel injected engines, the computer acts as a governor. The transmissions up till the 1996 also had a mechanical shift timing governor.
You can find used trucks at www.autotrader.com. You can also check www.craigslist.org for trucks for sale in your area.
The best place on the planet to buy a used flatbed truck is at www.WorkTrucksAndVans.com. You can also see a great selection of used work trucks, used utility trucks, used dump bed trucks, used cargo vans and used passenger vans.
You can buy used trucks from Penske at http://www.PenskeUsedTrucks.com
You can go to commercialtrucktrader.com to get a quote for your used semi trucks.