- Hybrid bonds (perpetual or convertible) are typically used by companies with stable cash flows and balanced capital structure, often with some headroom in debt metrics and robust equity to absorb potential losses.
- From the data: Ferrovial has substantial noncurrent liabilities and long-term borrowings, including infrastructure project financings. There is a notable equity base but also large negative items like Equity Measurement Adjustment and substantial noncontrolling interests. 
- The company shows positive cash flows from operating activities and substantial investments, but also high reliance on financing activities and changes in ownership interests.
- The presence of Perpetual Subordinated Bonds in the equity section indicates prior use of hybrid instruments, which is common for infrastructure-focused groups. However, the explicit equity position shows significant measurement adjustments and reserves, and comprehensive income is positive but not overwhelmingly strong.
- Given existing complex capital structure with significant debt, and prior use of hybrid form (Perpetual Subordinated Bonds) suggests some suitability, but the data set lacks explicit details on credit metrics, interest coverage, and hybrid instrument eligibility criteria (subordination, loss absorption, regulatory capital treatment). Therefore, data is insufficient to make a decisive assessment.

Answer: Insufficient Data
<answer>Insufficient Data</answer>