Abstract: A vehicle includes a chassis, a transmission shaft, a linkage, and a seat. The chassis has two front wheel units pivotally mounted thereto. The transmission shaft is rotatably mounted to the chassis. The linkage is connected between the transmission shaft and the two front wheel units for turning the two front wheel units upon rotation of the transmission shaft. The seat is fixedly mounted on the transmission shaft for the user sitting thereon to turn the transmission shaft and to further turn the two front wheel units relatively to the chassis.