flexible bollards vs fixed bollards: Which Is Right for You?
One of the most common questions we receive at Barriers Co is: "Should I use flexible or fixed bollards?" The honest answer is: it depends entirely on the application. Both have clear use cases where they excel and situations where they're the wrong choice.
What Are Flexible Bollards?
Flexible bollards (also called delineator posts or rubber bollards) are made from polyurethane, rubber or high-density polyethylene. When struck by a vehicle, they bend or flex — then spring back to their upright position. They absorb impact energy rather than transferring it to the vehicle or the foundation.
Key advantages:
- Vehicle damage is minimal on low-speed impact
- No damage to bollard itself — snaps back upright
- Lower installation cost — surface mount or surface-break
- Easy to install and relocate
- High visibility options in bright yellow or orange
Key limitations:
- Provide zero vehicle restraint — a determined driver will pass straight through
- Not suitable for security or anti-ram applications
- Can be knocked over by pedestrians if not properly anchored
- Less aesthetically suited to permanent public realm installations
What Are Fixed Bollards?
Fixed bollards are rigid steel, concrete or cast iron posts permanently anchored to the ground. They will not move on impact — the energy is absorbed by the vehicle and transmitted to the foundation.
Key advantages:
- Definitive vehicle exclusion — cannot be driven through
- Available in security-rated (PAS 68) versions for anti-ram applications
- Durable and long-lasting
- Wide range of aesthetic options (cast iron, stainless, granite-look)
- Delineates permanent boundaries clearly
Key limitations:
- Vehicle impact causes vehicle damage and potential injury
- Higher installation cost and effort
- Cannot be relocated easily
- Requires planning consideration for public realm
The Decision Framework
| Requirement | Flexible | Fixed |
|---|---|---|
| Traffic lane delineation | ✅ Yes | ⚠️ Overkill |
| Prevent vehicle access | ❌ No | ✅ Yes |
| Temporary installation | ✅ Yes | ❌ No |
| Pedestrian zone protection | ⚠️ Low risk only | ✅ Yes |
| Car park guidance | ✅ Yes | ✅ Yes |
| Security/anti-ram | ❌ No | ✅ Yes (rated) |
| Pavement protection | ✅ Low speed | ✅ Yes |
| Minimal vehicle damage risk | ✅ Yes | ❌ No |
Common Applications
Flexible bollards are ideal for:
- Cycle lane delineation on roads
- Car park entry/exit guidance
- Temporary site access control
- Loading bay parking guidance
- Drive-through lane guidance
Fixed bollards are ideal for:
- Permanent pedestrian zone protection
- Building facade protection
- Pavement/kerb protection
- Car park reserved bays
- Security perimeter protection
FAQ
Can flexible bollards stop a car?
No. Flexible bollards are designed to bend on impact and spring back — they will not stop or significantly slow a vehicle. Use security-rated fixed bollards for vehicle exclusion.
How long do flexible bollards last?
Quality polyurethane flexible bollards typically last 3–7 years outdoors before UV degradation affects their flexibility. Low-quality rubber bollards may harden and crack sooner.
Are flexible bollards suitable for cycle lanes?
Yes — flexible delineator posts are the standard treatment for protected cycle lanes on UK roads and are recommended in LTN 1/20 (Cycle Infrastructure Design).
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