3 ms·Do trains use QR codes to park? I can't find a good source.by thebooktocome 15y agoDo trains use QR codes to park? I can't find a good source.dkastner 15y agoYes, I know that patent is actually more specific than "driverless car." I was just being snarky.omouse 15y agoI don't understand why you would do that when patents are a legitimate concern and are a problem.