For which one of the following instances is a traffic collision report required?

A traffic collision report is required primarily when there are specific legal or regulatory implications associated with the incident. In this case, when a collision is applicable to the suspension, it indicates that the collision could potentially impact a person's driving privileges or involve violations that may lead to administrative actions, such as a suspension of a driver's license. This requirement exists to document the details of the collision, assess liability, and provide evidence for any administrative or legal proceedings that may follow.

The other scenarios presented do not inherently necessitate the completion of a traffic collision report. The cooperation of the arrestee, the time of the incident, or whether an arrest was made without any testing are not deciding factors in the legal requirement for a crash report. Instead, they may pertain to the overall context of the incident but do not directly influence the necessity of documenting the collision itself in terms of compliance with reporting laws or procedures.