Modern technologies in vehicles are all more prevalent and more accessible to a wider circle of people. They allow passengers and drivers that their driving is safer, more comfortable, faster if necessary and cheaper. The number of vehicles in the world is higher every day, so it is not surprising that environmental groups are concerned about the future of our planet. Since the number of vehicles cannot be reduced, various types of technologies prevent the creation of a variety of harmful gases and reduce them as much as possible. In addition to technologies that improve the purity of exhaust gases technologies that affect our driving safety are fairly applied. Security technologies are classified as active (that do not allow that accidents occur) and passive (which reduce injuries in the event of an accident). The most important part in every vehicle is certainly the engine, so it is logical that companies invest a lot of effort to enhance it with various different technologies. With those technologies engines work better, and they are cleaner and more efficient.