## 3 Results
### Reaction Strategies: Recommendations to Promote Tyre CPP Derived from the Interviewes
#### 3.4.2 Recommendations for Policymakers  
Based on the interview series, eleven recommendations for policy makers were derived:  
1. Make regulatory adjustments to ensure sustainable tyre CPP and contracting processes: The interview series showed a need for changes in legislation. In particular, the interviews on #2 and #5 referred to this. Two options for action were suggested in the interview on #2: introduce a certificate that complies with procurement law and can be made a requirement in procurement processes, or grant discretion to the contracting authorities if there is no established certificate. Another option is to make justification mandatory for non-sustainable publicly procured tyres. The reference to this recommendation was made in the interview on #5 to similar procedures for the use of electric vehicles. In several interviews, reference was made to service directives or council resolutions: as a recommendation and concerning plans for a specific organisation-wide pilot project in the interview on case #17. It is also important to learn from good practice in other areas of public procurement. Points of reference for this were given in particular in two interviews which highlighted the Federal Ministry's for Economic Affairs and Energy (BMWi) initiative to stimulate the development of specifications on energy emissions in the VgV. Likewise, the interviewee of #14 recommended council resolutions on city levels to promote sustainability and CPP. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Barriers Addressed** & **Recommendation** & **Relevant Cluster** & **Actor** \\ \hline \multicolumn{4}{c}{For policymakers} \\ \hline
1, 6 & R1—Make regulatory adjustments to ensure sustainable tyre CPP and contracting processes & In particular, B1 & P \\
1, 5 & R2—Promote the development of evaluation procedures that comply with procurement law & In particular, B1 & P \\
1 & R3—Declare tyres as a priority product for sustainable public procurement & In particular, B1 & P \\
1 & R4—Promote the procurement of retreaded tyres & all & P, PP \\
3 & R5—Conduct a cross-procurement level information & & \\
3 & campaign on sustainable CE tyres, also addressing vehicle procurement & all & P \\
3, 4 & R6—Provide information tools with aggregated content & all & P \\
3 & R7—Engage opinion leaders & all & P \\
2, 3, 7 & R8—Engage vehicle, tyre, and leasing providers all & All, in particular, V\&L & P \\
2, 3, 7 & R9—Initiate pilot projects & In particular, B1 & P, PP, B \\
4 & R10—Check the feasibility of increasing the threshold for European tenders for sustainable tyre procurement & In particular, B1 & P \\
4 & R11—Use the power of public procurement to move further & & \\
8 & & towards a sustainable tyre CE & recommendation) & P \\ \hline \multicolumn{4}{c}{For procurement organisations (partly together with other stakeholder groups)} \\ \hline
1, 3, 4 & R12—Implement sustainable procurement across your organisation & all & PP \\
5 & R13—Develop and use standards and certificates in a targeted manner & In particular, B1 & PP, B \\
8 & R14—In addition to the focus on sustainability in product characteristics, include CE compliant requirements concerning the disposal & all & PP \\  & (see also suggestions in the section for policymakers) & & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Strategies to promote a circular tyre economy in the public procurement context. As an additional measure, the interviewee of #5 referred to price aspects and suggested financial support for sustainable CE tyre procurement, comparable with the support for buying electric vehicles: 'You can see that since the government has subsidised electric vehicles, there are more and more sales of them.' In this context, the new CE Action Plan [46] recommends'rewarding products based on their different sustainability performance, including by linking high-performance levels with incentives.' An additional suggestion related to recommendation R1 is to provide special conditions for small procurement volumes to avoid an unnecessary burden.