“…In recent years, heavy vehicles, such as, trucks and buses have been the subject of aerodynamic studies with the aim of drag reduction and fuel economy improvement (Abdel Azim et al (1996), Kim (2004), Krajnovic and Davidson (2003), Lajos et al (1998), Saunders et al (1985)). A review of the aerodynamics of trucks, buses and trains is given in McCallen et al (2002).…”