Far down the road but coming toward them, coming upward […] was a chain of pearly lights. […] The long darkness was over. (57.82-57.89)
These are the novel's final lines, before the Epilogue, that is. The lights are the rescue crew that has decided to take Halloran seriously and go to the Overlook to check on the Torrances. The lights represent the break in isolation. They seem to end the book with a glimmer of hope.