Climate Tunnel Entrance
Introduction to the system

The ACO Climate Tunnel Entrance ensures that small animals are guided into the ACO Climate Tunnel and prevented from accessing the carriageway.

The ACO Climate Tunnel Entrance is used in conjunction with the ACO Guide Wall and ACO Climate Tunnel or Stilt Tunnel to make up a complete guidance and crossing system.image

The combination of these elements forms a smooth transition from the ACO Guide Wall into the ACO Climate Tunnel under the carriageway.

No metal reinforcement is used, so animals are not disoriented by distortion of magnetic fields, while the non-absorbent surfaces has minimal thermal conductivity, providing an ideal surface for amphibians to move along.

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  • Certified to Load Class C 250 BS EN 1433:2002.
  • Guides small animals into the tunnel under the road.
  • Side wings link ACO Guide Wall to Tunnel Entrance.
  • Use in conjunction with Guide and Tunnel systems.
  • No metal reinforcement.
  • Manufactured from polymer concrete.
  • Available as a complete kit.


  • Suitable for medium duty vehicle traffic.
  • Small animals are prevented from encroaching on the carriageway.
  • No discontinuity between guide and transfer units.
  • A complete seamless system to guide animals to safety.
  • Animals are not disoriented by distortion of magnetic fields.
  • Minimal thermal conductivity.
  • All necessary components on a single pallet.

Recommended applications

  • Highways
  • Nature conservation areas
  • Rail developments
  • Residential developments
  • Areas identified for mitigation measures

Not recommended applications

  • Access Roads
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