Many countries in Europe and parts of the US end up introducing measures, such as imposing lower speeds on highways, with the aim of reducing traffic accidents, saving energy and protecting the environment. This Thesis aims to examine the public reaction and the benefits of reducing the speed limit on Greek highways from 130 to 120 or 110 km/h. Following the established direction, a bibliographic search was carried out on the topic of the work. The literature had to fulfill three main conditions: refer to the original speed limit of 130 km/h, reduce it by 10 and 20 km/h and refer to motorways. Therefore, the literature was adapted to be scientifically accurate for the research. In addition, a questionnaire was created to collect data using the stated preference methodology, examining three different scenarios regarding speed limits. The data was then analyzed and mathematical models were created to understand the factors driving the participants’ decisions. After further analyses, polynomial and binomial regression models were created to evaluate the different scenarios.