I’m currently in the US (Washington DC) and this is how my transactions are breaking down:
-Swipe: 80% (sometimes with signature, often without):
-Chip and signature: 15% (sometimes just chip without signature)
-Chip and pin: 5%
Of the 20% that have chip machines, about half accept Apple Pay or contactless (so 10% of my transactions). It’s still very rare here.
Loads of businesses often use a payment system called Square which offers retailers cheap swipe and signature terminals and chip and signature terminals.
For swipe or chip, often they don’t even require a signature. And sometimes if I forget to sign, they’ll just do a squiggle for me on their terminal. So signatures are not taken seriously at all.