In this guide
- Standard Boom Lengths
- How to Measure Your Lane
- Straight vs Folded vs Double Arms
- Other Factors
Table of Contents
What standard boom lengths are available?
Barrier gate arms (booms) are typically available in lengths from 2.5m up to 11.5m. The most common sizes are 3m, 4m, and 6m: a 3m arm covers a standard single parking lane, 4m suits wider commercial entrances, and 6m+ arms are used for toll plazas and industrial sites where the control cabinet must sit away from the traffic lane.
The intelligent barrier gate series supports the full range, with heavier-duty models and double-arm configurations for the longest spans.
How do you measure your lane?
- Measure the clear width of the entrance from curb to curb (or wall to wall).
- Add 30–50cm of overlap on each side so the arm fully blocks the lane — a 3.5m opening needs roughly a 4m arm.
- Check the mounting position: the cabinet can sit on either side, but the arm length must reach past the opposite edge.
- For bidirectional lanes, make sure the arm length plus the cabinet footprint leaves enough room for the vehicle turning radius.
Straight vs folded vs double arms?
| Arm Type | Best For | Max Length |
| Straight boom | Standard parking lanes | 6m |
| Folded (articulated) boom | Low-clearance sites (ceilings, signs) | 6–8m |
| Double-arm boom | Wide industrial entrances | 8–11.5m |
Other Factors
- Wind load — longer arms catch more wind; exposed coastal sites may need stiffer arms or shorter lengths
- Opening speed — very long arms move slower; high-traffic lanes may prefer shorter arms with faster cycles
- Safety — add photo-eye sensors and light curtains on long arms crossing pedestrian paths
- Surface mounting — the base must be anchored for the torque of a long arm
Conclusion
The right barrier gate arm length is simply lane width plus overlap, adjusted for wind and speed requirements. When in doubt, round up: an arm that's slightly too long is safer than one that leaves a gap. Send us your lane dimensions and we'll recommend the exact model and arm configuration. Request a quote with your gate width today.