I haven't really noticed any difference in traffic levels. It dipped a bit during COVID for obvious reasons and now it's back to how it was for the most part.
https://roadtraffic.dft.gov.uk/regions/6 has a good chart - 20 billion vehicle miles to 19 billion. Interestingly from the chart, local traffic stayed about the same whilst main roads seem to have lost a little.
The ULEZ zone is now basically all of the city, it doesn't quite go to the M25 (motorway ring road) but anywhere that a tourist would even remotely think of as being London is well inside it.
https://roadtraffic.dft.gov.uk/regions/6 has a good chart - 20 billion vehicle miles to 19 billion. Interestingly from the chart, local traffic stayed about the same whilst main roads seem to have lost a little.
The ULEZ zone is now basically all of the city, it doesn't quite go to the M25 (motorway ring road) but anywhere that a tourist would even remotely think of as being London is well inside it.