Under what conditions is a lawful traffic stop permitted and how long can it last?

• A. When there is reasonable suspicion of a traffic violation or criminal activity; the stop must be brief and limited to addressing the violation and ensuring safety.
• B. When there is probable cause to arrest the driver.
• C. When the driver consents to a search.
• D. When the officer has an arrest warrant.

Answer: (A)

A lawful traffic stop is allowed when the officer has reasonable suspicion that a traffic violation or criminal activity is afoot. That standard is enough to briefly detain someone while the officer addresses the violation and, for safety purposes, takes appropriate steps (like checking licenses, registration, and warrants or ensuring safety on the road). The detention should be short and tightly scoped to completing those tasks; it ends once the objective is achieved.

Arresting the driver based on probable cause goes beyond a routine stop and becomes a custodial custody situation, not just a detour during a traffic stop. A search generally requires either probable cause, a specific exception, or voluntary consent, and an arrest warrant isn’t what justifies a standard stop in the first place.