When I wrote up the conclusions of my 2022 project, I proposed changes at 20 borders across Europe (you can find the details of the original proposals here).
However in three and a half cases so far there have been improvements in the cross border traffic, so amongst my Top 20, 16 and a half still remain to be fixed. Admittedly these changes are not thanks to my initiative, but I am of course happy to see the changes!
20 more problem borders were added to my list in 2023, and none of those have been solved yet.
Please use the links in the menu for details of the individual borders.