Now Playing: How this female trucker deals with men on the road

Now Playing: Tour of the truck cabs these female truck drivers live in while on the road

Now Playing: James Comey Part 6: Comey on a Trump impeachment

Now Playing: James Comey Part 5: Are there Trump tapes?

Now Playing: James Comey Part 4: Discussing Michael Flynn

Now Playing: James Comey Part 3: Trump asks for 'honest loyalty'

Now Playing: James Comey Part 2: The Hillary Clinton email investigation

Now Playing: James Comey Part 1: Telling Trump about the 'dossier'

Now Playing: Comey says his assumption Clinton would win was 'a factor' in email investigation

Now Playing: US and allies launch attacks on Syria

Now Playing: Iran, Russia should not associate with mass murder of innocent people: Trump

Now Playing: Pentagon officials remark on strikes in Syria

Now Playing: Strikes will establish a strong deterrent of chemical weapons: Trump

Now Playing: Couple drugged and blindfolded, and woman abducted in the middle of the night: Part 1

Now Playing: Police question boyfriend of abducted woman, doubt his story: Part 2

Now Playing: Couple in so-called 'Gone Girl' case denounced by police: Part 3

Now Playing: Man who kidnapped woman in so-called 'Gone Girl' case finally caught: Part 4

Now Playing: California city to settle with couple in so-called 'Gone Girl' case: Part 5

Now Playing: Couple in so-called 'Gone Girl' case convinced more suspects still out there: Part 6

Now Playing: Female trucker says she keeps a knife, mace after being attacked