The downside is other vehicles tailgating you or overtaking aggressively
Yes, I have found an increase in tailgating to be the downside of the 20mph limits. It seems worse than before.
Drivers then overtake dangerously, sometimes in the 20mph limit zone too, which can be quite scary.
According to that report, too, an advanced driving instructor in Wrexham said that in his opinion, driving behaviour has been badly affected as No one was doing under 30mph in the 20mph zones which made teaching learners more dangerous.
Overall, however, if casualties due to road accidents are dropping that has to be an optimistic trend.
However, it doesn't state how many casualties are pedestrians or those in cars.
There needs to be a campaign to make people, particularly children, to be more aware as pedestrians.
Remember the Tufty Club?