Which citation includes a grandfather clause for an old vision waiver?

The correct citation is 49CFR391.64, which pertains to the grandfather clause for old vision waivers. This regulation specifically addresses the conditions under which certain vision qualifications apply, including provisions for drivers who had previously received waivers. The grandfather clause allows these individuals to continue operating under older standards even if they do not meet the newer vision requirements.

This provision is essential as it acknowledges the status of drivers who may have been granted waivers before the current standards were enacted, ensuring they are not unduly penalized as regulations evolve. It protects the rights of these drivers while still maintaining safety standards for new applicants.

Understanding the implications of this citation is crucial for fleet managers, safety officers, and drivers themselves, as it directly affects qualification criteria and operational eligibility for certain drivers.