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Carpooling is an informal form of commuter ride-sharing that can mitigate traffic congestion and parking demand. While ride-sharing and carpool formation require both a driver and at least one passenger, there has been a lack of studies that explore potential users of carpooling and their role preferences (driver versus passenger); perceived incentives, attitudes and current mode choices may affect their willingness to carpool and their role preferences. This study examined the factors affecting individuals’ carpooling decisions and carpool role preferences using data from Ohio State University’s 2012 Campus Travel Pattern Survey. Based on individuals’ stated interests and choices, three market segments were identified: current carpool users, potential carpool users, and not-interested commuters. The analyses revealed that incentives and deterrents to carpooling significantly differ by role preference. People …