Information interaction is a crucial part of modern transportation activities. In this paper, we propose the idea of PASS: a parkinglot-\r\nassisted carpool method over vehicular ad hoc networks (VANETs). PASS aims at optimizing transport utilization by the\r\ncarpooling among car drivers who cover a part of the same traveling route. With wireless device enabled in the vehicle, a user can\r\neasily get matched vehicles information and then express his travel demands via radio queries over VANETs to the corresponding\r\ndriver. ?e driver can decide whether to provide carpooling services or not. We investigate the main challenges in PASS design, via\r\nthe parking lot to collect vehicle trajectories, via accelerator sensor to sense vehicle�s movement, establish a routing tree to delivery\r\nvehicle trajectory information to nearby parking lots, and design a suitable matching scheme to match the target vehicle in VANETs.\r\nFinally, simulation results prove that PASS is effective and efficient in carpooling among vehicle drivers.
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