This sort of thing has been suggested before, and its always suggested that it would be a "different part of the app".
The thing is, it needs to be a different app, period. Jack-of-all-trades apps become cumbersome and end up with more features to have bugs in them. If it was a feature that everyone would be likely to use, it would be better, but in this situation, right now, we have a user base who use this app for a daily drive, and bus routes wouldn't be of any use to any of them.
If such a feature was added, it would bring in an additional userbase who would use that feature, but not the driver's feature. There would be very little crossover. So therefore, no reason to put both features into the same app.