The images were posted to Twitter without any commentary and Troughton-Smith hasn't responded to any follower inquiries about their origin.
It's thought that the images may have been gleaned from iOS 7.1 beta 4. The second beta of iOS 7.1 brought a new 'Car Display' toggle.
It's also possible that screens may be from a new app that Troughton-Smith is working on. He is the developer behind the Speed 3 app.
Take a look at the images below