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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 ride sharing, private companies or individuals usually take on the responsibility of implementing and managing programs[1]

Factors influence Ride sharing

Individuals choose to participate in ridesharing based on time, distance, convenience, household characteristics, and the availability of the automobile[1].

Company/Workplace characteristics

Levels of ridership increase more when parking subsidies are decreased rather than when ridership is promoted through subsidies.

Income and Auto ownership

Individuals households that have less than 1 automobile per person are more likely to rideshare. Ridership decreases with gains in personal income and auto ownership. Ridesharing trips take more time than single use trip, and time is a finite resource, so those that have a vehicle and put a premium on saved time from single occupancy are more likely to drive alone.


Ridesharing increases as communiting distance increases. According to National Personal Transportation Survey data, 14.2% of commuters carpool during the trip shorter than 5 miles but 34.4% carpool at distances over 25 miles.


Ridesharing and public transit use increases near Central Business Districts (CBD) due to several reasons: 1. commutes are long and traffic is generally heavy to CBD. 2. Individuals are more likely to face parking fees in CBD 3. Public transit is more convenient and available in CBD.

Examples of Ridesharing Programs


Zimride is a online peer-to-peer ridesharing service for universities and corporations to connect people and facilitate ridesharing [2]. UCLA affilated students and employees can sign up for the service online by using their school email address, search for their starting point and destination, create a profile, request a ride, then pay on a per use basis. Alternately, drivers can create a profile, input a routine driving route, select their passengers, offer the ride, then receive money for their service. To incentivize ridesharing, UCLA offers discounts parking passes for 2 and 3 passenger carpools.


  1. 1.0 1.1 Hwang, Keith; & Giuliano, Genevieve. (1990). The Determinants of Ridesharing: Literature Review. UC Berkeley: University of California Transportation Center.
  2. http://www.zimride.com/howitworks/

Tsao, H-S. Jacob, and Da-Jie Lin. "Spatial and temporal factors in estimating the potential of ride-sharing for demand reduction." (1999). APA