The road carriers business in West Sweden is described as a cluster of the Swedish business world. This cluster has been exposed to great competitiveness and deregulation during about the last ten years. The road carrier cluster has been analysed by Porter´s diamond model. The preconditions for the successful growth of the cluster are presented. Especially the road carrier cluster´s opportunities and limitations have been taken into consideration. The study has been performed as a literature study, complemented by studies of magazines in the branch. Furthermore three interviews have been performed of an owner of a road carrier firm. One day has been spent as carrying out an ethnographical study as a driver of a trailer truck. The conclusion of the study is that there are many factors influencing the development of the road carriers business. The road carriers business furthermore has a strong influence from the general business cycle.