The wind resistance of a 12-meter barrier arm (like those used in parking lots, toll booths, or security gates) depends on several factors, including its material, design, motor strength, and installation method. Here’s how it typically resists wind forces:

1. Material & Weight

Aluminum or carbon fiber: Most barrier arms are made of lightweight aluminum (for smaller arms) or carbon fiber (for heavy-duty applications). Aluminum is lighter but less wind-resistant, while carbon fiber meterial provides better stability.

2. Arm Design

Length & Balance: A 12-meter (39.4 ft) arm is extremely long and would be rare for standard applications (typical arms are 3–6m). Such a long arm would require:

  - Counterweights to balance the load.

  - Truss or lattice structure to reduce wind drag (similar to crane booms).

  - Aerodynamic shaping (rounded edges) to minimize wind resistance.

3. Motor & Mechanism Strength

1）High-Torque Motor: A long arm needs a powerful motor to resist wind forces and remain stable.

2）Electromagnetic Brake: Many systems have an automatic brake that locks the arm in place when wind pressure exceeds a threshold.

3）Spring assistance: Some arms use springs to absorb wind shocks.

4. Foundation & Mounting

1）Heavy-Duty Base: A 12m arm would require a reinforced concrete foundation or a heavy steel base to prevent tipping.

2）Multiple Support Points: For very long arms, additional support poles or cables (like guy wires) may be needed to reduce sway.

5. Wind Speed Resistance

Standard barrier arms (3–6m) can typically withstand 30–50 mph (13–22 m/s) winds.

A 12m arm would face much higher wind loads and may need:

  - Active stabilization (sensors that adjust arm position in wind).

  - Automatic lowering in extreme weather.

  - Wind-rated certification (e.g., DIN or ISO standards for wind resistance).

Conclusion

A 12-meter barrier arm would be highly unusual for standard applications and would require special engineering to resist wind—likely involving reinforced materials, additional supports, and active stabilization systems. For comparison, most parking barriers are under 6m, while 12m arms would resemble industrial or aviation barriers, which use heavy-duty designs.