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>>>>The electrical/computer faults in most modern cars really only show themselves when the cars are about 10 years old. Range Rovers are particularly notorious for this
My commodore is only 2 years old with 57k on the clock. I don't think it was a "fault" just one of those stray gltches that get computers confused. The computer is in charge of everything, brakes, steering, motor, gearbox and heaps of annoying "beeps".
I thought I had got used to the lane assist, giving a little tug on the steering, when I changed lanes, without indicating. But driving on a narrow country road with only a centre line was bad. I think it took the gravel/bush edge as the outside line and kept wanting to push me onto the gravel verge, fortunately lane assist can be turned off, but you have to take eyes off the road and lean towards the passenger side to do it. But it's default is on, so if you stop, you have to remember to turn it on again.
My biggest beef is with the "limited to 30km/hr" thing. The computer only had a checksum error in it's brake communication, so it didn't know there was a brake problem, only that it didn't know there wasn't. I can think of lots of situations wear suddenly limiting the vehicle to 30km/hr could be dangerous. On one of our typical narrow windy country roads, you could easily have somebody doing 110 come round a corner to find you directly in front. Even on a long straight freeway, when it's busy a vehicle going that slow would be a big traffic hazard.
There was no explanation for the sudden slow down, if there'd been a warning that the brake check system had a problem, it's easy enough to make sure brakes are working, and drive accordingly, just in case. Yes Lotto I know some people have no idea. But forcing them to go that slow, when there's probably not a problem, doesn't improve safety.