News flash....cars and airplanes operate in very different environments aerowise. Are they both moving through air....why yes, but that is where the similarity ends. Cars are in ground effect and have zero laminar flow going across their skins, so vortex generators would only serve to make a turbulent layer more turbulentier....which makes no sense, which is why they're crap when it comes to auto aerodynamics.
The "Vortex Generator" on the CRV Honda headlight assembly is an optical reflector designed to make the turn signal more visible from a greater angle on the opposite side of the car. I got em on my 04 Civic too.