The objective of this study is to discuss the probability for introducing the AHS services to the merging sections of expressway by conducting field experiment of information system. Firstly, the possible procedure and contents of information system are discussed. Secondary, simple information system is simulated at a few merging sections of the Metropolitan Expressway and we confirm that the smoothness of driving operation and the mitigation of driver's stress are achieved. Finally, the directions of the development of information system at merging sections are shown.