Based on Fishbein and Ajzen (1975, 1980) and Ajzen and Madden (1986, 2002) proposal, this paper puts forward an extension of “Planned Behavior Theory” (PBT) for the understanding of the pro-ecological behavior. The main aim of this article is to explore the importance of emotional aspects as a contribution for the comprehension of the “low vehicle use” behavior, surpassing TPB explanations. This work uses the constructs of the theory, but also includes the emotional variable. For attaining the objective of the research a questionnaire was built and applied to 797 subjects of a Galician population (Spain). Results explaining Anger like one of the variables that confirming this behavior and its weight is superior to the traditional variables like perceived behavioral control.