The Tollbooth — Stephen Donald Huff

As the zombie apocalypse begins, a small group of civil servants find themselves locked in their tollbooths, which are heavily armored against run-away automobiles. Initially, trapped inside their hellish fishbowls, they curse their situation. As they watch the world fall apart around them, however, they realize they are safe... for a time. Cramped, dingy and institutionally depressing, their duty station becomes a backstage view of Armageddon. Even a bad day on the job is better than a good day amid a zombie apocalypse!