The first thing you need is an expert opinion. This can be drawn up by officially recognised experts for motor vehicle traffic or a technical service that is recognised in accordance with § 30 of the EC Vehicle Approval Regulation (EG-FGV) for testing complete vehicles of the vehicle category concerned.
The report must state the necessary exemptions from the StVZO, the suitability of the vehicle or vehicle combination and the requirements and conditions deemed necessary in the interests of road safety. The exemptions must be specifically described and their necessity justified.
You can then apply for the exemption authorisation in writing (e.g. by e-mail).
The competent authority will check your application and, if it is favourable, will grant you the exemption.
Important: The vehicle or vehicle combination may only be driven after an exemption has been granted.