bmw e21: no traction system and no ABS
bmw e30: early models came as same as e21 but latest models came with ABS
bmw e36 :1992-1994 no abs and some models with only driver airbag
1994-1997 :ABSwith standard driver airbag and optional passenger airbag
bmw e46 : all models came with standard six airbags divided on car , ESP : ELECTRONIC STABILITY CONTROL , ABS , and BAS : BRAKE ASSIST FOR EMERGENCY BRAKING
BMW (E90-E92) ALL MODELS CAME WITH STANDARD SIX AIR BAGS AND FOR THE FIRST TIME BMW INTRODUCED THE (DTC) WHICH IS DYNAMIC TRACTION CONTROL which is more advanced than ESP and help the driver to maintain stability on all roads ................
generally all bimmers are safe to ride and God forbid also safe at accidents...the upcomming information are from bmw official website and it will explain briefly the function of the stability control:
Dynamic Traction Control (DTC).

Dynamic Traction Control (DTC) allows more wheel slip and thus a more dynamic driving style with higher wheel traction and DSC controlling stability. A small amount of spin on the drive wheels improves traction when pulling off from a standstill in snow or on loose terrain.

Dynamic Traction Control (DTC) is a sub-function of the Dynamic Stability Control (DSC) system that can be turned on and off. DTC has two major roles: to regulate traction and to enable sports-style driving while providing active stability control.
When the drive wheels start losing traction the DSC automatically begins stabilisation measures. The Dynamic Stability Control system curbs the engine output and stops slip on the wheels. In exceptional situations, however, a small amount of wheel slip can be an advantage.

When driving in deep snow, slush or on loose terrain a small amount of wheel spin improves traction. For these occasions, as well as those when the drivers want a sportier driving style, the DTC can be activated by pressing a button and this allows more slip and reduces the DSC’s curbing of the engine. The result: better traction and more thrust.

The DTC also makes driving on snow and ice-free roads more dynamic. When activated, the DTC allows sporty drivers more room to manoeuvre around curves than the Dynamic Stability Control and even permits controlled drifts. The driver retains complete control over the vehicle in every situation and the Dynamic Stability Control’s stabilising measures remain active even when the DTC is activated.



also see : BMW Dynamic Stability Control Overview - YouTube
BMW DSC1 test comparision demo. animalscraze.com make people happy - YouTube
so if u own a bmw equipped with esp or dtc never turn it off on unless u r goin to drift ..........hope i explained it right