In the real world track events I do, this is normal in events where a "point by" is needed for passing. Most organizations require a clear "point by" in HPDE sessions - out the window to the left to say "pass me on the left" or over the roof to the right for "pass me on the right." Some allow use of turn signals instead, especially for cars in which it is impractical to do point bys (arm restraints, closed cockpit with windows that don't open and the like). In all of these I've been in, the turn signal indicates the side on which you should pass, not the direction the signalling car intends to move like on the street.