Earlier quoted context omitted.
All the things you list are accurate... Also, more 20mph speed limits on urban routes useful to cyclists. Cheap and effective for creating a more cycling friendly environment.
To paraphrase current civil engineering doctrine: A sign doesn't do anything to turn a four lane boulevard into a road people drive 20 on. The enforcement needed to back up the sign is not the kind of thing people put up with in the western world (a few pockets of Europe notwithstanding). You need to actually design the road to make 20mph a reasonable speed.
- On quieter roads in retail areas they added painted white lines, but most importantly they've enforced them so delivery drivers don't park over the cycle lane.
- On roads in busier areas that had street parking they've shifted the street parking inwards a couple of meters, and put a cycle lane between the street parking and pavement. This means the driving part of the road is narrower, so people drive slower.
- On other streets that were too small for a cycle lane and street parking, they have removed street parking and put up a cycle lane separated with small bollards (a few cm high, so can be driven over). These are usually in areas where you would have only driven at 20km/h. We have a lot of cobbled streets and they aren't (I'm wondering if it's intentional) very well maintained, so most are very uneven. The only issue with these is that delivery drivers do park over them, because now there is nowhere else for them to park. Of course people complained about the reduction in street parking, but that issue was quickly forgotten.
- They changed a lot of road directions (bikes are exempt) so that you cannot drive through the city center to get across the city. This did increase traffic a little in other routes (this happened at the start of this year, so hard to tell because of covid), but it means that as a cyclist you can easily cycle through the city center which has much less car traffic. Of course people complained, but again it was quickly forgotten.
- A few streets that were popular for commuters were tested being pedestrian only in the summer (case numbers here were fairly low then, so traffic levels were maybe 75% of normal). Again people complained, but the issues were quickly forgotten.
- Proliferation of food delivery services have meant there are much more bikes on the road, so drivers are more cautious.