This document summarizes a presentation about using gamification and serious gaming to promote behavioral change in transportation choices. It describes a game called "From5To4" that was used by several organizations to encourage employees to take one less car trip per week and travel smarter. Key aspects of the game included team rankings, progress monitoring, and making the game fun, easy to use, and autonomy-supportive. Examples were given showing reductions in car trips, fuel saved, calories burned, and CO2 emissions as a result of the game. Lessons learned emphasized the importance of positive reinforcement, meaningful badges/awards, participant autonomy, and flexible game design.