How can I ask and send messages when my girlfriend doesn't come home?

Just say, let her drive well, don't rush back to the news, safety first. I'll call you or text you when I get on the train to tell you that I'm safe.

The point is that you care about her. But give her space. Indeed, don't say reading text messages while driving, even walking on the road is not safe. Don't let your worries become a burden.