IFR traffic patterns are pretty much up to us. Meaning, we issue vectors that we want the pilot to fly. We, as controllers, must always maintain safe separation of all aircraft within our airspace during times of IFR weather conditions or a pilot's request for vectoring.

VFR works differently. Generally, a pilot maintains his own degree of separation and navigation. As a rule of thumb, VFR traffic patterns shall consist of five legs with left hand turns. Right hand traffic is at the discretion of the Tower controller. A good Tower controller will assess his airspace and make the rational decision regarding right and left-handed traffic for VFR closed traffic.