What is one requirement for renewing a driver's license in Guam?

To renew a driver's license in Guam, one of the primary requirements is passing a vision test. This requirement ensures that all drivers maintain adequate vision necessary for safe operation of a vehicle. Vision tests are a standard practice in many jurisdictions, designed to detect any deterioration in eyesight that could impair driving abilities. This safety measure helps reduce traffic incidents caused by vision-related issues.

The other requirements listed focus on different aspects of driving regulations. While proof of citizenship and completion of a driver education course could be relevant in other contexts or for obtaining a new license, they are not typically mandated for the renewal of an existing license. Proof of vehicle insurance is an important aspect of vehicle operation, but it is not a prerequisite for renewing a driver's license specifically. Thus, passing a vision test stands out as a focused and relevant requirement for renewal.