A 'highway novel' is often a type of story that has a significant part of its plot taking place on highways or roads. It might involve characters on a journey, perhaps running away from something, or going towards a new destination. The highway serves as not just a physical setting but also a metaphor for the characters' paths in life.
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.
Highway Men is more likely a fictional tale. It might draw inspiration from real-life events or scenarios but is not a direct account of actual happenings. Writers often use their imagination to craft such stories.
The Lincoln Highway incorporates real-life inspiration, but it's not a strictly 100% true story. The author likely took liberties to create a more engaging narrative while still drawing from real-world situations and themes.