It is still indeterminate worldwide whether automatic fire suppression systems should be equipped in road tunnels or not. However, recent serious road tunnel fires in Europe showed that an automatic fire suppression system which is able to suppress fire in the initial stage should play a very important role in road tunnel fire safety. In this paper, the installation of automatic fire suppression systems in many countries is collected and demonstrated. Three major fire suppression systems, sprinklers, water mist, and foam system, are analyzed for the application in tunnel fire protection. Also, their advantages and drawbacks are presented.