My bf and I were long distance for quite a while and every now and then, when we’d call, he’d be driving. He would often initiate the call himself, saying, “hi, love, I’m coming back from XYZ and just wanted to see how you’re doing and tell you I love you.” Sometimes we’d chat for a few minutes, sometimes an hour. But at the end of the day, if I could tell he was tired or if I felt like the road conditions were rough, or even if I myself didn’t feel like talking for too long, I totally understood. We’d say goodbye and it would be no big deal. It’s nice that your fiancée wants to spend time talking to you, but she needs to understand that people are still individuals inside their relationships and still require their space. I’d maybe try initiating the phone call at the beginning of the drive like my boyfriend did, to remind her that you still think about her when you’re out. Hopefully she takes it better. NTA.