EMPIRICAL-ANALYSIS OF BEHAVIORAL INTENTIONS OF SINGLE-OCCUPANT AUTO DRIVERS TO SHIFT TO HIGH OCCUPANCY VEHICLES

The emphasis in transportation planning has recently changed from long-range, high-capital investments to short-term, low-cost transportation system improvements. The development of incentives for bus riding and carpooling, particularly for the work trip, plays a major role in this resource management process. This study is specifically designed to uncover factors which influence the intentions of the single-occupant auto commuters to switch to buses and carpools and to suggest operating policies consistent with the intent to encourage the use of high-occupancy vehicles. The single-occupant auto commuters are segmented into several potential ridesharing markets on the basis of their expressed intention to take a bus or a carpool if certain transportation system modifications were effected. Three groups of switchers are identified: those who are positively oriented towards taking a bus, those who would only switch to a carpool, and those who would consider either of the ridesharing modes. Bus convenience is the most important variable associated with the shift intention. Perceptions of carpool comfort do not appear to be important, rather, perceptions of carpool schedule flexibility, cost, safety and a short wait in traffic are prime factors associated with potential carpool shifting. Additional models involving mode satisfaction are reviewed and policies which enhance bus convenience and minimize waiting in traffic for carpools are suggested to recruit the potential ridesharers. © 1979.