How to Measure the Right Barrier Length for Your Entrance

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To find the right parking barrier length, measure the clear width of your entrance from one side to the other, then choose a boom that spans that width with a little overlap so it closes fully. Also check the space needed for the barrier housing and the height of the boom above the road.

Start With the Clear Width of the Entrance

The most important measurement is the clear width of the lane the barrier will control. Measure from the inner face of one side wall, curb or post to the inner face of the other side. Take the measurement at the exact point where the boom will sit, not at the road edge, because walls and kerbs often narrow or widen along the lane.

Write down the width at two or three points and use the smallest value as your reference.

Account for the Boom and the Gap at the Ends

The boom needs to reach across the lane when closed. The usual approach is to match the boom length to the clear width, adding a small overlap so the tip meets the housing or the opposite post with a stable closing position. A boom that is too short leaves a gap, and one that is too long puts extra load on the motor and can bend under wind.

Your installer will confirm the final boom length based on the model and the mounting method.

Check the Mounting Space Beside the Lane

The barrier housing takes up space on one side of the lane, so measure how much room is available beside the entrance. Look at the depth from the road edge to the wall or fence line, and the free width needed for the housing and any service access.

Space for the housing footprint and base plate
Room to open the cover for maintenance
Clearance from gates, walls and sidewalks

Consider the Height and Vehicle Clearance

The boom must rise high enough for the vehicles that use the entrance to pass underneath when open. Measure the height of the tallest vehicle that will use the lane, such as a delivery van or a truck, and make sure the open boom clears it with a comfortable margin.

Also consider the boom height above the ground at the closed position, so cars do not catch the tip when driving over a dip or slope.

Plan for Traffic Speed and Lane Use

How often and how fast vehicles pass affects the right choice. A private driveway used a few times a day has different needs from a busy residential or commercial entrance. Think about whether cars will wait at the barrier, whether there is a second lane, and whether pedestrians share the space.

These factors influence the boom type and the speed of operation rather than only its length.

Confirm Standards and Safety Details With the Engineer

Barriers must work safely with the people and vehicles around them. Safety features such as detection loops, photocells and safe-closing sensors should be planned from the start. For exact requirements and any clearance values, check with the engineer or the relevant standard rather than relying on rough estimates.

Written measurements and a site drawing make this step much easier to review and approve.

Frequently asked questions

Should I measure the width at the road or at the wall?

Measure at the point where the boom will sit, which is usually the place where the barrier is mounted. Walls and curbs can change along the lane, so check more than one point and use the smallest figure.

Do I need to add extra length to the boom?

A small overlap is normal so the boom closes securely. Too much extra length adds load and can cause bending, so the final length should be confirmed with the supplier.

What if my entrance is wider than standard?

A wide entrance may need a longer boom or a different barrier design. Share your measurements and photos so the options can be reviewed.

Who should check the final measurements?

Your installer or the factory should take on-site measurements and confirm the final drawing before production starts. This avoids mistakes in length and mounting position.

Common mistakes to avoid

The most common error is measuring only once at a single point and ignoring walls or curbs that narrow the lane. Forgetting the housing space and the vehicle height clearance can also cause costly changes after installation.

Our recommendation

Measure at three points across the entrance, note the smallest clear width, and send the figures along with photos and a rough sketch to your supplier. Ask for an on-site measurement before the drawing is approved.

Summary

Measure the clear entrance width at the mounting point, add a small overlap for the boom, and check the housing space and vehicle height. Confirm the final figures with a site measurement.

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