From European, legal POV offensive enough to prohibit further use of the vehicle right on the spot and confiscation of your license plate...

Our min thread dept is 1.6mm (1/16th"), so when those TWI's start to 'surface' its urgently time for new ones...
Aside the legal ramifications due 'not roadworthy condition', is also any insurance liability nil and void...
Besides crappy water drainage, will cupping and wear pattern also impact cornering and handling...
Why the uneven wear?
- road crest
- better road visibility in left turns (vs reduced in right ones)