According to the Supreme Court in Michigan v.Sitz,involving sobriety checkpoints,detaining a car briefly at a sobriety checkpoint requires:

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The Supreme Court held that sobriety checkpoints do not violate the Fourth Amendment's prohibition on unreasonable searches and seizures, even though they involve a brief detention of motorists without individualized suspicion. The Court found that the State's interest in preventing drunk driving outweighs the minimal intrusion on individual privacy caused by sobriety checkpoints, and that the checkpoints are effective in achieving that goal. Therefore, no individualized suspicion is required at sobriety checkpoints.

According to the Supreme Court in Michigan V