Protection systems for amphibians and small animals have to satisfy a range of different criteria, balancing road-building requirements with wildlife conservation needs.

ACO polymer concrete climate entrance units regulate moisture in two different ways: via climate openings at the road edge and via climate plates with drainage holes on the tunnel floor. Rainfall immediately penetrates the sensitive entrance area, ensuring the required air humidity and quickly adjusting to the ambient temperature. In periods of drought, the system benefits from direct connection to the ground moisture via the slotted climate plates.

ACO polymer concrete properties are favourable to amphibians and other small animals. Because the water penetration depth is zero, not only are components durable, animals will also normally be walking on materials which have a moist non-abrasive surface. Polymer concrete also contains no metal reinforcement, meaning that amphibians won’t be disorientated.