Roland Perry wrote:
In message , at 18:42:49 on Sun, 26 Oct
2014, Neil Williams remarked:

Not permanently locked ones, but a brake in the diff (rather that at the wheel).

What would be gained by duplicating the function?

Braking a wheel isn't the same as locking a diff. Apart from anything
else, the locked diff still powers both wheels.

No it's not the same, but it's what traction control is. And ASC can still
power both wheels, independently reducing torque on each wheel to the level
that the tyre's grip can sustain. That provides more traction than a simple
locked diff.