99.94% of scientists believe in the effect of CO2 emissions on climate change. To tackle this, many parts of society must become sustainable. In Dutch road projects this drive for a sustainable transition is noticed in the last few years. Currently, the actions for climate inclusive road projects have not been successful. Climate consideration are limitedly part of the scope of these projects. A lack of understanding on road planning system, and the existence of success and failure factors limits the sustainable transition in road projects. This research explores the existence and workings of critical success factors in Dutch road planning. The exploration and identification of factors is achieved by using a comparative case study approach. Three Dutch road infrastructure project were analysed. The research established three main findings (1) The lack of early (integral) inclusion of climate concerns impedes the success related to climate aspects of a project. (2) The existence of a project climate goal is essential in guaranteeing the constant inclusion of climate concerns and climate related consideration in the planning process. (3) The success of inclusion and translation of climate ambitions into goals depends on the sustainable mind-set of project organisations, political players, stakeholders and public. The findings of this research improve understanding of road planning processes and climate related transition processes. The research elaborates and corroborates critical success factors found in other disciplines. The main findings while only based on three case studies, correspond to the findings in other disciplines.