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Coming to a sudden stop in a busy lane may well be necessary if there's some unexpected obstacle in front of you. Which is why road rules require maintaining sufficient distance to the car in front of you that if it has to brake hard, you have enough time to react and do the same thing without ramming into it.

IIRC police has already said that at least some cars involved in the accident did not maintain such a safe distance, and their drivers thus bear their share of responsibility for the crash.

What “actual research”? This article? There’s no source.

> No, not if someone comes to a sudden stop in a busy lane. Why not? You’re meant to maintain enough distance to the car in front of you at all times that you should be able to come to a complete stop without rear-ending them.