Transport economics is a subject that studies how people, goods, and services move around from one place to another. It looks at how different forms of transportation, such as cars, trucks, buses, trains, planes, and boats, are used and what affects their use. It looks at things like how much it costs to travel by these different types of transport, how long it takes, and how people and goods get from one place to another in the most efficient way. It also looks at how different types of transportation can help to reduce pollution, traffic, and congestion.