5.2.9. Other points of attention

Print Friendly, PDF & Email
Last update: June 2023

Fences must be thoroughly checked as part of the ordinary road inspection schedule at least once a year and more frequently during the first year after installation, and also in sections of particular conflict or after strong winds, floods or other climate events that can damage fencing (see Chapter 7 – Maintenance). Beyond inspection for regular maintenance, particular attention must be paid to how mesh is fixed to the posts, to connections with the various devices, and how the fence is fixed to the ground (Figure 5.2.29).

Figure 5.2.29 – Fencing should be regularly inspected and maintained as fences could be damaged by A: vandalism; B: embankment landslides; C: traffic accidents (Photos by: Cerema). To avoid Less favourable / More research required Optimal

Planting vegetation beside fencing is a controversial topic which requires monitoring and evaluation to provide any evidence-based recommendation. A dense row of bushes planted along the fence exterior is recommended in some European countries with the aim of discouraging deer from jumping over and to reinforce the fence corridor effect, guiding wildlife to crossing structures. On the contrary, other countries advise against this practice because it has been observed that some species, such as roe deer, attempt to jump over vegetation with the risk of striking or breaching the fence (Figure 5.2.30A).

A corridor free from bushes and tree branches beside fencing is recommended by many transport operators. The main aim is to avoid damage caused by vegetation to the fence. It also could prevent species such as pine or stone marten, from climbing over the fence (Figure 5.2.30B).

In every situation, the planting of vegetation that provides edible fruit or is attractive to foraging animals must be avoided.

Figure 5.2.30 – A: Example of a row of bushes planted beside a fence and which is supposed to prevent deer from jumping over. More research is required to demonstrate the effectiveness of this practice and that it does not encourage any deer species to attempt jumping over (Photo by: M. Trocmé); B: Maintenance tasks along fencing to provide a corridor free of vegetation and particularly from branches that may damage the mesh (Photo by: Tunels BCN). To avoid Less favourable / More research required Optimal

Special attention should be paid to places where fencing crosses a ditch. Devices can be installed to allow water to flow while preventing wildlife from entering infrastructure (Figure 5.2.31). 

Figure 5.2.31 – Systems to avoid animal entrance via the intersection of fencing with perimeter drainage. A: An anti-penetration grid device to the right of temporary flow evacuation devices (Photo by: Cerema); B: Fence connection to a concrete structure (Photo by: P. Fournier – GRECE); C: Non-return valve on a downspout preventing wildlife from accessing the drain (Photo by: P. Fournier – GRECE).

Maximum file size: 134.22MB

Tell us if we can share parts of your documents on this website