When specifying or installing a height-restriction barrier, a number of common pitfalls can lead to vehicle strikes, safety risks, operational disruption, and compliance issues. Getting it right from the outset is key to long-term performance.
Common mistakes to avoid:
- Setting the wrong height clearance
Installing the barrier too low can restrict legitimate vehicles (e.g. vans or service vehicles), while setting it too high reduces its effectiveness. Most UK car parks typically use 2.0–2.2m clearance, but this should always be based on actual site requirements and vehicle types. - Poor or insufficient signage
Lack of clear signage is one of the biggest causes of collisions. Common issues include:- No advance warning signs
- Signs only at the barrier (not on approach routes)
- Faded or hard-to-read height markings
Always install RA1/RA2 reflective height signs at both the barrier and along the approach.
- Inadequate warning distance
Drivers need enough time to react. If the barrier is placed immediately after a turn, ramp, or blind spot, vehicles may not be able to stop safely. Advance warning gantries or goalposts should be used in higher-risk layouts. - Not accounting for larger or unexpected vehicles
Failing to consider:- Delivery vans
- Refuse vehicles
- Emergency services
can lead to access issues or damage. In some cases, a removable, swing-arm, or alternative access point may be required.
- Incorrect positioning or layout
Barriers installed too close to entrances, junctions, or busy pedestrian areas can create congestion or safety risks. The layout should allow safe vehicle approach, turning, and visibility. - Weak or inadequate foundations
Poor installation is a major cause of failure. Shallow or poorly prepared foundations can lead to:- Movement or leaning posts
- Reduced impact resistance
- Premature wear
Posts should typically be embedded 300–500mm into concrete, depending on size and ground conditions.
- Ignoring site gradients and levels
On sloped surfaces, the actual clearance can vary across the width, increasing the risk of strikes. The crossbeam must be installed level and checked across the full span. - Lack of maintenance planning
Even a correctly installed barrier can become unsafe if not maintained. Failing to check signage, fixings, and alignment can lead to long-term issues.
Avoiding these pitfalls ensures your height-restriction barrier delivers effective vehicle control, clear communication to drivers, and long-term reliability.
At Aremco Barriers, our UK-manufactured height restriction systems are designed for accuracy, durability, and compliance. We provide clear signage, robust steel construction, and practical installation guidance, helping you avoid costly mistakes and ensure your system performs exactly as intended.
