<P> Tank trucks are used a lot like rail cars are, but they will usually transport refined fuel to a fuel station, like a gas station . Trucks are usually used to carry smaller capacities of oil short distances . Like railcars these trucks can carry several different forms of this petroleum, but they do not really carry the petroleum in its crude oil form because it would take a lot of trucks to deliver the volume of crude that the refineries demand . These trucks can deliver this fuel to gas stations, or deliver the fuel straight to the consumer . These trucks are used in situations where it would be illogical to use railcars, pipelines and tanker ships . Places like gas stations; that are not able to be accessed by marine vessels, and do not demand the volume that is delivered by pipelines or trains, would get their fuel from tanker trucks . This allows a rational and cost effective way to deliver the fuel to the consumers through the gas station . Common sizes range from 400 up to 7,500 US gallons . </P> <P> Every method of transporting this petroleum has the potential for a major oil spill . However, the amount of oil spilt while it is in transport is a surprisingly small percentage of the total oil spilled . Most oil is spilt during loading and unloading and industrial plants accidentally spilling the oil into the ground . Regulations are created to help prevent oil from spilling everywhere . Some of these regulations include forcing marine tankers to have double hulls, and making a minimum of two man crew on trains that are carrying crude oil . Even though the least amount of oil spills happens when the oil is in transit, regulations are still put in . if the oil was spilt while it is in a ship, tank truck, pipeline or rail car, it can result in fire, poising of plants, injuries and fatalities of the crew and citizens . There are also regulations put in place to prevent the spilling of oil and petroleum vapors while loading and unloading these fuels as well as processing the oil . The goal of these regulations is to make sure that all the oil is delivered or processed equals the amount of oil that was received . A simple example of this is the vapor guard on the nozzle of the gas pump at the gas stations . These regulations make sure that the companies watch to see that they do not have leaks in any pipes or equipment . When the oil is being processed is when it has a great potential of being leaked, so constant watch is required . These regulations are constantly changing as more discoveries on how to better control oil spills are being found . </P>

Petroleum products are transported through the ocean transport mode by way of the