"Wildlife reflectors do not alter the behavior of ungulates to reduce risk of wildlife-vehicle collisions" finds EJWR paper.
Collisions of vehicles with wildlife pose a serious risk to humans and animals, causing great financial and ecological damage each year.
While various mitigation measures have been developed, only a few are economically and logistically feasible. Among these, wildlife warning reflectors arguably enjoy the greatest popularity, although recent studies have shown that they have no long-term impact on wildlife-vehicle collisions or on the behavior of animals along roads.
The EJWR study reports that ungulates were more likely to leave the roadside area with reflectors present. However, this effect only lasted 16.5 days and did not influence the risk of a collision with a vehicle.
In addition, reflectors did not alter the driving behavior of motorists. The study, therefore, concludes that wildlife warning reflectors are not effective for reducing vehicle collisions with wildlife.
BDS member Dr Jochen Langbein an ecological consultant and deer-vehicle collision expert noted on his twitter page that the study that it only covered 'passive' deterrents; not 'active' devices with their own signals. He further stated that results with newer 'active' devices that emit blue & yellow flashing lights plus variable warning sounds were looking more promising.
Read EJWR Paper