George Russell was penalised for rejoining the track unsafely after reversing out of the escape road into oncoming traffic.
For this he was penalised 5 seconds to be added to his race time.
Is such a penalty fair, too harsh or too lenient?
It seems to be a very dangerous situation, which could have ended a lot worse.
A few years ago Sebastian Vettel was given a 5s penalty for rejoining unsafely. So it would seem to be consistent.
However, in Vettel's case he outbraked himself, and went across the grass and back onto the track, just in front of Hamilton. It lasted a second or two.
Russell was up the escape road, had to selected reverse and then back out. He had time to assess the situation and act accordingly.