## Common ground
All options refer to level crossing gates—barriers that control vehicle and pedestrian access at railway crossings.
## Options at a glance
**4421.99 – Made of wood**
- **Defining trait:** Constructed primarily from wood, typically used in low-speed or rural settings.
- **Typical examples:** Wooden barriers with manual or simple electric operation on country rail lines.
- **Best fit when:** The gate is visibly wooden, lightweight, and installed in non-high-traffic or low-speed areas.
**7308.90 – Made of iron or steel**
- **Defining trait:** Constructed from metal (iron or steel), offering greater durability and strength for high-traffic or heavy-duty use.
- **Typical examples:** Automatic, robust gates at busy rail crossings or near highways.
- **Best fit when:** The gate is metallic, heavy, and designed for frequent or high-speed train traffic.
## Key differences
| Feature | 4421.99 (Wood) | 7308.90 (Iron/Steel) |
|------------------|----------------------|--------------------------|
| Material | Wood | Iron or steel |
| Durability | Lower | High |
| Typical use | Rural, low-speed | Urban, high-traffic |
| Weight | Lighter | Heavier |
## How to choose
1. Is the gate primarily made of wood? → 4421.99
2. Is it made of metal (iron or steel)? → 7308.90
## Overlaps & pitfalls
A gate may have both wooden and metal components (e.g., wooden posts with metal arms), but the **primary structural material** determines classification. If unclear, prioritize the main load-bearing material. No option is inherently more correct—choose based on dominant construction material