Obligatory HN angle: I’ve often hypothesized that if credit cards in the US were chip and pin (like the rest of the world), NJ would support self serve in a microsecond. Eg no way would customers be comfortable handing their card over then shouting out their pin to rue attendant.
Hypothesizing is good. Getting data to validate or invalidate your hypothesis is better.
In South Africa they use chip and pin (also tap and go for small amounts, and tap and pin for larger amounts. Most gas is tap and pin).
Incidentally there is also no self-service for gas country wide.
The way it works is that each pump has a portable wireless card machine. The attendant fills in the amount, you tap, and if necessary he hands you the machine to enter a pin. They look away (in an obvious manner) for this step. He doesn't handle your card.
Incidentally this is true mostly everywhere - you handle your card, not the vendor.
Obviously you never give your PIN to anyone - much less shout it across a forecourt.
Sadly in the USA the prevalence of wireless cc terminals is amazingly low; even in restaurants you hardly ever see them, although this is getting by better, and (same hypothesis) would likely change if chip and pin was required here
