Cat Fan
Cats and stats
All your points make sense and are a good example of LTNs working well.Some journeys will be displaced - people will keep driving but go a different route, either onto the new boundary roads or by taking a totally different route through a different area.
Some car journeys will evaporate through a number of mechanisms:
Some people will switch a journey to public transport, especially in London.
Some people will start cycling (or scooting or similar) a journey
Some people will start walking a journey
I just don't think the specific Streatham Wells LTN we have been talking about is going to work well.
The neighbouring Streatham Hill LTN post implementation report showed a large amount of displacement and not much increase in cycling
There are already school streets in place for the local schools so LTNs don't really offer much new there.
You mention on street parking is gone in your example. There is a ton of legal and illegal on street parking on Leigham Court road (and speed bumps and pot holes) and this the road taking all the traffic displacement, it's wedged between two largeish LTNs now.
I would support the LTN more if they took away all the parking on LCR. It's not joined up thinking by Lambeth. And they are perhaps scared of a big backlash from everyone who lives on the road or goes to nursery/school there.