Professor Garrett Fagan's History of Ancient Rome is an excellent drive-time companion.
Now, understand I got mine for free from a friend--but The Teaching Company frequently has sales, so keep an eye out.
And listen closely to the Roman era from the Gracchi Brothers to the Age of Augustus. Some uncomfortable resonances for Yanks, sorry to say.
Tragically, Professor Fagan passed away from pancreatic cancer in 2017. But his knowledge and evident gifts as a teacher live on in these lectures.
Any recommendations on the Roman era are welcome in the comments.