Crowd control barriers are the unsung workhorses of UK event management. Used at concerts, festivals, sporting events, public demonstrations, and major city centre occasions, these steel interlocking barriers define safe zones, guide pedestrian flows, and protect both the public and performers when properly deployed. This step-by-step guide covers everything from pre-event planning through to on-site installation and post-event teardown — so your crew can set up safely, efficiently, and in compliance with event safety guidance.
Understanding Crowd Control Barriers: What Are They?
The barriers most commonly used for UK event crowd management are interlocking steel crowd barriers — sometimes called "Mojo barriers" after one of the major manufacturers. They typically consist of:
- A welded steel tube frame, typically 1100mm high x 2300mm wide
- Horizontal or diagonal cross-tube infill to provide rigidity and prevent climbing
- Interlocking hooks on each end that connect adjacent barriers to form a continuous run
- Folding feet at the base that keep the barrier upright when freestanding
Standard crowd barriers are galvanised steel, weighing approximately 15-20kg per section. Aluminium variants are available for weight-critical applications. Typical barrier rated crowd pressure loads are 3.0-5.0 kN/m² in accordance with BS EN 13200-3.
Pre-Event Planning: The Foundation of Safe Crowd Management
Produce a Site Plan
Before a single barrier is moved, you need a detailed site plan showing:
- All venue entrances and exits (with widths)
- Emergency access routes — ambulance, fire, police ingress points
- Planned crowd flow routes and gathering areas
- Stage, performance, or focal point positions
- Vendor, catering, and other attraction positions
- Backstage and restricted-access areas
- Planned barrier runs with measurements
Calculate Your Barrier Quantities
Measure each planned barrier run and divide by the barrier width (typically 2.3m per section) to get your section count. Add 10-15% contingency for adjustments on-site. Don't forget: ends, corners, and access gates all require special consideration.
Plan for Emergency Access
This is the most critical planning requirement. Every crowd barrier system must include:
- Clearly marked emergency exit points at regular intervals (UK guidance: maximum 25m between emergency exits for dense crowds)
- Minimum clear width of 1.2m per 250 people that the exit must serve
- Gate barrier sections (with quick-release mechanisms) at all emergency exits
- Staff positioned at gates during the event who can open them immediately on instruction
Risk Assessment and Safety Plan
Under the Management of Health and Safety at Work Regulations 1999 and the Health and Safety at Work Act 1974, a written risk assessment for crowd management is required for public events. For larger events, an Event Safety Management Plan incorporating crowd management details is required. The Event Safety Guide (the "Purple Guide") published by the Events Industry Forum is the authoritative reference for UK event safety management.
Step-by-Step Installation Guide
Step 1: Establish Reference Points
Before laying out barriers, establish your key reference points on the ground — use marking paint, chalk, or tape to mark the start and end of each barrier run. Mark all gate positions. Having reference marks means your crew can work quickly without constant measuring.
Step 2: Check Your Equipment
Before installation begins, inspect each barrier section:
- Check all hook connectors are present and undamaged
- Confirm feet fold out freely and are not bent
- Check for cracked welds or structural damage — remove damaged sections from use
- For gate barriers, test the quick-release mechanism before installation
Step 3: Begin with Anchor Points
Start each barrier run from a fixed anchor point where possible — a wall, a fence post, a stage barrier fixing point, or a heavy object that won't move. The first section in a run is the most important: if it shifts, the whole run shifts. Secure the anchor section before adding subsequent sections.
Step 4: Connect Sections
Work along the run, connecting each section by engaging the hook connectors on each end into the cross-bar of the adjacent section. The hook should be fully engaged — a half-connected barrier is potentially more dangerous than no barrier, as it creates an unexpected failure point. Most barriers click or lock into position when properly engaged. Check each connection as you go.
Step 5: Set the Foot Angles
The angle of the folding feet affects the stability of the barrier and the direction in which it resists force. For most crowd management applications, feet should be set pointing away from the expected crowd pressure direction — this is the position of maximum stability against crowd loading. For barriers that will receive loads from both sides (such as a central dividing barrier in a crowd route), set feet at 90° to the barrier run for balanced resistance.
Step 6: Install Gates
Gate sections should be installed at all marked emergency exit points before the event opens to the public. Test each gate:
- Open and close the gate using the quick-release mechanism under normal conditions
- Confirm the gate opens in the correct direction (outward from the crowd, or in the direction of emergency evacuation)
- Ensure a person can open the gate single-handedly in under 5 seconds
- Assign a specific staff member to each gate and brief them on when and how to open it
Step 7: Conduct a Walk-Through
Before the event opens, walk the entire barrier system with your event safety officer:
- Check there are no gaps or sections that could shift under crowd pressure
- Confirm emergency exit widths are clear and unobstructed
- Check that barrier runs don't create any entrapment zones (dead-end pockets where the crowd could be compressed)
- Verify emergency vehicle access routes are open and clearly marked
Post-Event Teardown
Safety First on Teardown
Crowd barrier teardown accidents are not uncommon, particularly when tired crews work quickly after a long event. Key safety points:
- Do not dismantle barriers until the crowd has cleared the area — toppling barriers into a crowd cause serious injuries
- Work in teams of two minimum for handling barrier sections — at 15-20kg each, individual handling is a manual handling risk
- Stack barriers safely as you go — horizontal stacks with toe boards, not leaned against surfaces where they could fall
Inspection During Teardown
Teardown is the best time to inspect barriers for damage — the event will have subjected them to real loads. Mark or set aside any damaged sections for repair or disposal before they go back into stock. Damaged barriers in the inventory create future safety risks.
Common Installation Mistakes to Avoid
- ❌ Creating dead-end barriers that trap crowd members — always ensure there is an exit from every enclosed area
- ❌ Inadequate gate provision — never have a barrier run longer than 25m without a gate
- ❌ Setting feet in the wrong direction — improperly angled feet reduce stability significantly
- ❌ Failing to check connections — a section that disconnects under load creates a sudden gap with the potential to topple adjacent sections
- ❌ Blocking emergency vehicle access — a barrier run must never block a route that emergency services might need
- ❌ Working alone on installation/teardown — always work in pairs with crowd barriers
Summary
Crowd control barrier installation is a skill that rewards careful planning. A well-designed barrier system is almost invisible in operation — it guides crowds smoothly without anyone noticing the infrastructure that's making it work. A poorly designed or incorrectly installed system becomes obvious only when something goes wrong, and crowd safety incidents can have devastating consequences. Follow the steps in this guide, take your time in the planning phase, and always prioritise emergency access in your layout design.
Barriers Co supplies event-grade crowd control barriers for purchase and hire across the UK, with next-day delivery for purchase orders and competitive hire rates for events. Contact our events team for a quote tailored to your event size and layout.