FALL ARREST VS. TRAVEL RESTRAINT — WHICH SYSTEM DO YOU NEED?

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Both fall arrest and travel restraint systems use a harness, a connecting device, and an anchor point. Both are forms of personal fall protection recognized under Ontario Regulation 213/91 (Construction Projects). But they serve fundamentally different purposes, and using the wrong one — or confusing the two — can get someone killed.

The distinction is simple in concept: a travel restraint system prevents you from reaching the fall hazard. A fall arrest system stops you after you have already gone over the edge. Everything else — the components, the calculations, the planning — flows from that basic difference.

Travel Restraint — Preventing the Fall

A travel restraint system is designed to physically prevent a worker from reaching a point where they could fall. The system keeps the worker back from the edge or opening, making a fall impossible as long as the system is properly configured.

How It Works

The worker wears a full-body harness connected to a fixed anchor point by a lanyard or lifeline that is short enough to prevent them from reaching the fall hazard. If the anchor is 3 metres from the edge and the lanyard is 2.5 metres long, the worker physically cannot reach the edge — even if they try.

Components

• Full-body harness — CSA Z259.10 compliant. The harness can connect at the dorsal (back) D-ring or, in some travel restraint configurations, at side or chest D-rings.
• Restraint lanyard — a fixed-length or adjustable lanyard that limits the worker's range of movement. Unlike a fall arrest lanyard, a restraint lanyard does not need a shock absorber because the system is designed so that the worker never falls.
• Anchor point — must be capable of withstanding the forces that a worker can apply while working (a static load). Travel restraint anchors do not need the same strength rating as fall arrest anchors because there are no dynamic fall forces involved.

When to Use Travel Restraint

• Working near a roof edge — when the work can be performed entirely within the restraint zone and the worker does not need to approach or look over the edge
• Near floor openings — when a guardrail has been temporarily removed and the worker must stay back from the opening
• On elevated platforms or scaffolds — where the system can reliably keep the worker within the platform boundaries

Advantages

• No fall occurs — the worker never goes over the edge, so there is no impact, no suspension trauma, and no rescue needed
• Simpler rescue planning — since the system prevents falls, the rescue plan is less complex
• Lower anchor point requirements — anchors for travel restraint do not need to withstand the dynamic forces of a fall arrest

Limitations

• Restricted mobility — the worker's range of movement is limited by the lanyard length, which can make some tasks difficult or impossible
• Requires careful setup — if the lanyard is too long or the anchor is too close to the edge, the system will not prevent a fall. A travel restraint system that allows the worker to reach the edge is not a travel restraint system — it is a poorly configured fall arrest system without a shock absorber, which is extremely dangerous.

Fall Arrest — Stopping the Fall

A fall arrest system is designed to stop a worker who has already fallen. It allows the worker to reach and even work at the edge or over the edge, but it catches them if they go over. The system absorbs the energy of the fall and brings the worker to a controlled stop.

How It Works

The worker wears a full-body harness connected to an anchor point by a shock-absorbing lanyard or self-retracting device (SRD). When the worker falls, the shock absorber deploys (or the SRD locks and decelerates), absorbing the energy of the fall and limiting the arrest forces on the worker's body to a survivable level — under 8 kN (approximately 1,800 pounds of force).

Components

• Full-body harness — CSA Z259.10 compliant. Must connect at the dorsal (back) D-ring for fall arrest. Side D-rings and chest D-rings are not rated for fall arrest.
• Shock-absorbing lanyard — CSA Z259.11 compliant. Contains an energy absorber that deploys during a fall, extending the lanyard and reducing the forces on the body. When fully deployed, a shock absorber typically adds 1.07 metres (3.5 feet) to the lanyard length.
• Self-retracting device (SRD) — CSA Z259.2.2 compliant. An alternative to a shock-absorbing lanyard. The SRD pays out and retracts cable or webbing as the worker moves. When it detects a fall (rapid acceleration), it locks and decelerates the worker over a short distance.
• Anchor point — must be capable of withstanding at least 22.2 kN (5,000 pounds) per attached worker, or be designed by a professional engineer. This is significantly stronger than a travel restraint anchor.

Free Fall Distance — The Critical Calculation

When using a fall arrest system, you must calculate the total fall distance to ensure the worker does not hit the ground or a lower level before the system arrests the fall. This is where many setups go wrong.

The total fall distance calculation for a standard 6-foot (1.8 m) shock-absorbing lanyard includes:

• Free fall distance — the distance the worker falls before the system begins to arrest. With a 1.8 m lanyard, the maximum free fall is 1.8 m (assuming the anchor is at foot level).
• Shock absorber deployment — adds up to 1.07 m (3.5 feet) as the energy absorber extends
• Harness stretch — the harness and its connections stretch approximately 0.3 m (1 foot) during arrest
• Worker height (below the D-ring) — approximately 1.5 m (5 feet) from the dorsal D-ring to the worker's feet
• Safety margin — a minimum of 0.6 m (2 feet) clearance below the worker's feet

Adding these together: 1.8 + 1.07 + 0.3 + 1.5 + 0.6 = 5.27 metres (approximately 17.3 feet) minimum clearance required below the anchor point when using a standard 6-foot shock-absorbing lanyard with the anchor at foot level.

If you do not have that clearance, you need a shorter lanyard, a higher anchor point, or an SRD (which typically limits free fall to less than 0.6 m).

A fall arrest system that allows the worker to hit the ground before the arrest is complete is not a fall arrest system — it is a fatal setup error. Always calculate your fall distance before connecting.

Deciding Which System to Use

The decision follows a logical sequence:

• Can the fall hazard be eliminated? Install a guardrail, cover the opening, or redesign the task to eliminate the need for personal fall protection. If yes, do that first — it is the top of the hierarchy.
• Can the worker be kept away from the edge? If the work can be done without approaching the fall hazard, use a travel restraint system. The lanyard must be short enough to make it physically impossible for the worker to reach the edge.
• Must the worker work at or beyond the edge? If the task requires the worker to be at the edge or leaning over it, travel restraint will not work. Use a fall arrest system with proper clearance calculations and a rescue plan.

Common Mistakes

These errors are found on Ontario construction sites regularly and have contributed to serious injuries and fatalities:

• Travel restraint lanyard too long — the worker can reach the edge, making the "restraint" system useless. If you can touch the edge while connected, the system is not configured correctly.
• Using a restraint lanyard for fall arrest — a restraint lanyard without a shock absorber will transmit the full force of a fall to the worker's body. This can cause fatal internal injuries even if the worker does not hit the ground.
• Insufficient clearance for fall arrest — connecting a 6-foot shock-absorbing lanyard to an anchor 3 metres above the ground. After the fall, the shock absorber deployment, and harness stretch, the worker hits the ground.
• No rescue plan — a worker suspended in a harness after a fall arrest can develop suspension trauma within 15 to 20 minutes, which can be fatal. Every fall arrest setup requires a written rescue plan that can be executed quickly.
• Anchor point too weak — connecting a fall arrest system to a vent pipe, conduit, or handrail that cannot withstand 22.2 kN. The anchor fails, and the system fails with it.
• Connecting to the wrong D-ring — using a side D-ring or chest D-ring for fall arrest. Only the dorsal D-ring is rated for fall arrest forces.

The Bottom Line

Travel restraint keeps you from falling. Fall arrest catches you after you fall. Both have their place, and choosing the right one depends on the task, the available clearance, and the site conditions. What is never acceptable is using neither, or using one in a configuration that defeats its purpose.

If you are not sure which system to use or how to calculate your fall distance, ask. Talk to your supervisor, consult your company's safety program, or call your training provider. Getting it wrong is not a minor error — it is the difference between going home and not going home.