Cars often have to be kept in emissions laboratories at a constant temperature for at least 12 hours prior to a test. The engine must not be started until the car is subsequently positioned in the test cell. The car is secured in a brake test-bed called a dynamometer, with all driving wheels loaded at the same time. While in the test cell, emissions, wear, fuel consumption, heat and so on are measured. When the car has been tested it has to be moved out of the test cell and it is once again important that the engine is not started. In some cases the engine also has to be stripped down for measuring. Stringo is used to transport the car to and from the dynamometer. New components and ideas are tested in research and development departments. In most cases cars may not be started and driven inside these departments, and there is consequently a major need for car movers.