Ridesharing or carpooling, decreases the number of vehicles on roadways when individuals share a vehicle with one or more individuals on a commute. While the U.S. Department of Transportation promotes ridesharing, private companies are usually responsible for implementing and managing programs
Factors that influence Ridesharing
Individuals choose to participate in ridesharing based on time, distance, convinience, household characteristics, and the availability of the automobile. Based on this, individuals 
- Hwang, Keith; & Giuliano, Genevieve. (1990). The Determinants of Ridesharing: Literature Review. UC Berkeley: University of California Transportation Center.