A roadway allowed multiple speeds across the lanes could be how to get around this.
If the citizens of a transport zone don’t like the rules as they stand, ie, one single speed for all lanes, they should lobby to vary them.
Apart from cases where multiple speeds happen, the speed limit is the speed limit, the person behind contravenes rules if they speed, use the shoulder, etc. They’re in the wrong, they have agency, and decide to cause the unsafe situation.
The person ahead, as that video showed to the tune of straight funktown, may cause worsened traffic conditions, but they’re not the people being dangerous on the road. (Assuming they are going within the range of the expected limit)
The instance could be a problem if you scroll through the ‘local’ feed often and thats where you see a lot of things you don’t wish to see. A European or special interest instance might suit your context, (Portuguese?), better.
I spend more time on my ‘local’ (aussie zone) feed than ‘subscribed’ or ‘all’ and its definitely nicer, so a move like this can work.
But you could also optimise your own ‘subscriber’ feed as another option.