Abstract: A vehicle steering means with a first front ground-engaging steerable wheel located in the front center of the vehicle; second and third front ground-engaging wheels located either side of the first front ground-engaging wheel with means for adjusting the steer angle and the height depending on the steer angle of the first front ground-engaging wheel. When the first front ground-engaging wheel has a straight-ahead steer angle, the second and third wheels are also straight-ahead and all three front ground-engaging wheels are in contact with the ground; and when the steer angle of the first front ground-engaging wheel is turned, the steer angle of the front ground-engaging wheel on the outside of said curve is turned at least partly towards the steer angle of the first front ground-engaging wheel, the steer angle of the front ground-engaging wheel on the inside of said curve is not substantially turned towards the steer angle of the first front ground-engaging wheel.

Abstract: A vehicle comprising: steering means for operation by a user, —one or more rear ground-engaging wheels; a first front ground-engaging steerable wheel (34) located substantially in the centre at substantially the front of the vehicle; second and third front ground-engaging wheels (36, 37) located either side of the first front ground-engaging wheel (34) with adjustment means for adjusting the steer angle and the height depending on the steer angle of the first front ground-engaging wheel, the adjustment means being configured such that: when the first front ground-engaging wheel (34) has a straight-ahead steer angle, the steer angles of the second and third front ground-engaging wheels (36, 37) are also straight-ahead and all three front ground-engaging wheels are in contact with the ground; and when the steer angle of the first front ground-engaging wheel (34) is turned such that motion of the vehicle would describe a curve, the steer angle of the front ground-engaging wheel on the outside of said curve is tu