This Is Not a Test (1962)

On a quiet night along a desolate rural road in the western US, a police officer establishes a roadblock, halting every vehicle in sight. After a few cars and a large truck come to a stop, he reveals the alarming news: the nation is facing a potential nuclear strike. With the truck available, he insists it could serve as a makeshift bomb shelter, offering the best chance for survival. As the reality sinks in, panic and anxiety escalate among the gathered group, creating a tense atmosphere as they grapple with their fate.