How do I use an NFC tag to start or stop a trip?

NFC tags are perfect when you don't have CarPlay or Bluetooth — for example on a bicycle or motorcycle. Buy any NTAG-compatible NFC sticker, place it where you can tap your phone (dashboard, fuel tank, handlebar), then in the Shortcuts app: Automation → + → NFC → Scan your tag → Run Immediately, then add Speedometer's "Start or Resume" action. You can use one tag for both start and pause if you set the automation to toggle, or use multiple tags for different actions (e.g. one tag to start, another to stop).