Wildlife warning systems to avoid wildlife collisions

Wildlife warning systems to avoid wildlife collisions
Installation of warning systems for the prevention of accidents involving deer at known deer crossing points. © Conséil d’Isère

Involved sectors

Forestry, Hunting, Spatial planning, Nature protection, Transport

Affected habitats

Areas for settlements and transport


This involves the installation of warning systems for the prevention of accidents involving deer at known deer crossing points. A network of infrared sensors covers both sides of the road to a distance of around 300 m. If an animal enters this area, it is detected by the sensors. These send an impulse to a traffic warning signal which lights up and warns approaching drivers of the immediate danger.


Impact in particular on Big mammals
Ecological impact  
Reduction of fragmentation or creation of new valuable habitats Does not mitigate the barrier effect of a road. However, it is a very effective method of reducing the number of accidents involving deer at hazard hot-spots.
Other The system aims to change the behaviour of car-drivers, not deer. Drivers are alerted to an acute, rather than a potential, hazard.
Time of realisation for measure Immediate: Impact starts as soon as the system comes into operation.
Impact scope Very localised (plot): This measure has a very localised impact on both sides of a section of road to a distance of around 300 m. If integrated into regionally significant wildlife corridors, however, it can also have impacts beyond the immediate locality.


Implementation period Days: The system can be installed quickly once a decision has been taken on where it should be located (in consultation with hunters).
Frequency Recurring: Long-term measures, to be adapted as required.

Economic and legal aspects

Costs Medium (10'000-100'000 EUR): Costs of this type of system amount to approx. € 60,000-100,000. More compact and flexible solutions are also available (e.g. mobile systems).
Socio-economic impacts Medium: Prevents damage to vehicles, physical injury to individuals and loss of game animals.
Sources of financing Other private sources, Public: local, Public: regional, Public: national, Public: European
Legal situation Voluntary cooperation among stakeholders.

Further information

Evaluation A pilot project involving Calstrom-type warning systems carried out from 1995-1997 in Switzerland had very positive effects.
Information Switzerland: Wildtier Schweiz http://www.wild.uzh.ch/
Contact Switzerland: Expert: Roman Kistler, Fishing and Hunting Administration of Thurgau Canton (CH) Expert: Paul Marchesi, DROSERA - écologie appliquée SA, Sion (CH)

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