This is the best summary I could come up with:

The Welsh parliament has passed a law bringing down the speed limit on all residential roads and busy streets to 20 mph (30 km/h).

Wales will introduce a default speed limit of 20 mph (30 km/h) in built-up areas from next year, in a bid to lower road collisions and noise pollution, as well as encourage people to walk or cycle.

The Welsh parliament voted on Tuesday to back the plan, which will bring down the speed limit currently set at 30 mph (50 km/h) on most busy streets and residential roads.

Both Labour and Plaid Cymru, who have a cooperation agreement and hold almost three-quarters of the 60 Senedd seats, backed the plan, but it has been met with criticism too.

Reasons for opposing the scheme ranged from concerns it could “annoy” drivers to an increase in journey time and congestion.

“They are quite rightly very concerned as they believe that pollution is increasing because cars have to drive in a lower gear and wait longer at traffic lights, there have also been more accidents,” he said.

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