Who is allowed to issue a certificate on the testing of a speed limiter?

The ability to issue a certificate for the testing of a speed limiter is a regulated process in Germany. The correct options are based on the authorities recognized by law for such actions.

1. The vehicle manufacturer officially recognized to do so: Manufacturers have the necessary knowledge, tools, and legal authority to conduct tests and issue certificates for their vehicles.

2. A workshop authorized to do so by an authority: Certain workshops receive official authorization to conduct these tests, ensuring they meet specific standards and regulations.

Choosing option 3, "All garage workshops for commercial vehicles," is incorrect because not all workshops are legally allowed to perform this function without the required authorization. Only those specifically recognized by the relevant authorities can issue valid certifications for speed limiters. This distinction is important to ensure vehicle safety and compliance with traffic regulations.