This actually sounds kinda cool. My car is coming with HBA but I didn't ask for it. Some ordering bug at the time I ordered. Now I might actually be looking forward to this feature. I thought it was just an on and off thing.
2013 335i Sedan
| Mineral Gray / Black Dakota | M Sport | Dynamic Handling, Tech, Premium, Sport ZF8 & HK Audio
Future: 2014 M235i
| Manual | Estoril Blue / Terra | Tech, Premium, HK Audio, & Driver Assist