The US isn't the only country that doesn't use PINs on cards. (Also, I suspect that we're trying to skip past the chip as quickly as possible; it's why mobile wallets started being pushed around the same time the cards got chips. The jury's still out on that, however.)

Speaking of mobile wallets, I don't know how common contactless is at petrol stations (didn't rent a car on my recent trip over there) but I was able to use Apple Pay for nearly everything--including buying rail tickets at a machine and on the Underground. No signature required. ^