Two specs decide whether a barrier gate feels fast and fits the lane: boom arm length and opening speed. Both are linked — a longer arm needs more torque and is typically slower.

Boom arm length

Most barrier booms are straight aluminium arms from 3 to 6 m. Very wide lanes use a fencing or articulated (folding) boom to clear the opening without an oversized single arm. Match arm length to the lane width plus a small overlap so vehicles cannot slip around.

Opening speed

Opening speed is quoted in seconds for 90 degrees of travel. Typical ranges:

• 1.5 to 3 s — high-traffic, DC servo barriers.
• 4 to 6 s — standard AC barriers for low-traffic sites.

Trade-offs

A longer arm increases inertia, so very long booms are paired with stronger motors and may open a little slower. Skirt or fencing booms add wind load and should be specified with a suited motor.

Specifying for your site

Measure the lane, estimate peak cars per hour, then pick the shortest arm that seals the lane with the fastest motor your budget allows. Our barrier gate guide maps speed to application.

Frequently Asked Questions

How long can a barrier gate boom be?

Standard barrier booms run from about 3 to 6 meters. Wider lanes use fencing or folding booms rather than an oversized single arm.

Does a longer boom open more slowly?

Generally yes. A longer arm has more inertia, so it is usually paired with a stronger motor and may open slightly slower than a short arm.

What does 1.5 to 3 second opening mean?

It is the time for the boom to travel 90 degrees from closed to open, typical of DC servo barriers built for high-traffic sites.