### transport:

Vehicle
* Any vehicle is hybrid when it combines two or more sources of power.
* Most vehicles are like small power-plants on wheels, using gasoline as their source of fuel.
* Most vehicles carry gasoline
  - depreciate as they get older
  - equipped with side curtain airbags also include side torso airbags
* Most vehicles have batteries
  - dead batteries
  - engines
  - radios
  - provide energy
  - transport only one person
* Most vehicles use brakes
  - disc brakes on the front wheels
* Some vehicles get power from animals
  - human muscles
  - wind
* Some vehicles have air resistance
  - automatic shoulder belts with lap belts that are fastened manually
  - kill deer
  - lose energy
  - move on or in the water
  - use banks of supercapacitors for storing energy instead of batteries. * move on land. Most land vehicles have wheels. Examples are bicycles, cars, motorcycles, and trains. * move on or in the water. Examples are boats, ships, and submarines. * get power from human muscles. Examples are bicycles and skateboards. * get power from engines. Examples are automobiles, ships, and aeroplanes. * get power from animals. Examples are carts and chariots. * get power from wind. Examples are sailboats and iceboats. * have no power. Examples are gliders and balloons
* account for almost one-third of all smog causing pollution.
* also contribute to the formation of ground-level ozone, or smog
  - emit nitrogen oxides and hydrocarbons which contribute to acid rain and smog
  - produce greenhouse gases that contribute to global warming
* are also a major cause of smog, so less driving means cleaner air
  - the leading source of hydrocarbons in urban runoff
  - as definitely liquids as pigments are solids
* are capable of carry
* are located in freeways
  - streets
  - machines
  - major sources of urban air pollution and greenhouse gas emissions
  - mechanisms
  - mediums
  - notorious as death traps in tornadoes, because they are easily tossed and destroyed
  - one of the dominant sources of urban air pollution in South Asia
  - physical objects
  - several models and colors of autos and trucks, as well as motorcycles
  - subject to wear as they age
  - substances
* are the fastest growing source of emissions
  - major source of hydrocarbons at urban locations
  - single greatest source of pollutants in Northern Virginia
* are used for mobility
* can alter skin absorption.
* come in all shapes and sizes, just like people.
* continue to increase in size, power, and fuel consumption.
* emit carbon monoxide, a pollutant that robs the body of oxygen, which is hard on the heart.
* have advantage
  - fronts
  - less emissions than they used to
  - limits
* have many advantage
  - more advantage
  - momentum
  - significant advantage
  - size limits
  - smell
* includes sections.
* means cars, vans, trucks, and buses.
* pose a serious threat for burrowing owls roosting along roads.
* produce a large percentage of air pollution
  - share of our greenhouse gas emissions
  - motive power
* range in size, shape and type of fuel used.
* still account for two-thirds of our air pollution.
  - components
* using road fuel gases emit significantly fewer pollutants than petrol and diesel vehicles.

Water transport
* is also the only feasible way to ship most internationally traded goods
  - largely non-existent in Ethiopia
  - primarily the responsibility of the vascular tissue
  - still a vital part of trade in many places
* occurs in all biological membranes.
* requires regulation, and dynamic control is provided by stomata.

### transportation systems:

Short line
* are transportation systems.
* railway which conducts business on a local or regional basis.