BMW has come up with an innovative way of undermining arch-rival Audi - by placing a giant billboard above its Hong Kong dealership.
The massive advertisement for the new 5-Series sits on a wall over the showroom windows.
See the Audi v BMW giant billboard
Audi and BMW have a long history of aggressive advertising towards each other, including waging war on billboards in California, points-scoring in European print adverts and, recently, Audi described BMW as "second best" in a primetime television advert.
