This report summarises the work that has been conducted in a large project about fire detection and fire alarm systems in heavy vehicles. The main goal of the project has been to develop an international test standard for fire detection systems installed in engine compartments of heavy vehicles. For the purpose of defining a test method background information has been compiled regarding fire detection technologies, relevant standards and guidelines, research in the field, durability factors associated with the environment, typical fire scenarios and fire causes. In addition, numerous experiments have been performed in order to provide data to develop the test standard. A separate goal in the project has also been to provide recommendations on fire detection in bus and coach toilet compartments and driver sleeping compartments. Some of the conducted work has been published in three previous SP reports and the work not covered in these is presented in more detail in this report. However, this report summarises all work done in the project.