Maybe a disgruntled former member of the Glee club who feels wronged. This person has a vendetta and uses their knowledge of the club's weaknesses. They lurk on the 'highway to hell' and try to sabotage the club's journey, for example by stealing their sheet music or spreading rumors among the members to cause internal strife.
One possible plot could be that the Glee club members find themselves on a road trip that takes an unexpected turn and they end up on a 'highway to hell' in a metaphorical sense. Maybe they encounter various challenges like breakdowns, getting lost in a spooky area, and having to face their inner demons. They could sing songs to boost their morale and gradually find their way out of this difficult situation.
Well, 'A Season in Hell' often centers on themes like existential angst, the pain of isolation, and the quest for redemption. It delves deep into the human psyche and the challenges of finding one's place in society.
Clive Barker's 'The Hellbound Heart' is a more horror - leaning fantasy. It focuses on a device that can open portals to hell. The descriptions of hell and the entities from there are very unique and it offers a different take on the traditional idea of hell in fantasy fiction.
I'm not sure as I haven't read it specifically. But it might be about survival, considering 'Hell's Half Acre' could imply a tough or dangerous place, and the story could revolve around characters' struggle to survive there.
The idea of Highway 666 ghost stories is mainly for entertainment. It's a way to add an air of mystery to an otherwise ordinary roadway. There is no scientific evidence to support the existence of ghosts on this highway. People like to tell these stories around campfires or to tourists to give them a thrill, but they are more in the realm of legend than reality.