Among all the potential health risks, vehicle collisions with non-native deer are perhaps the most serious. 

Almost 30,000 traffic accidents a year are believed to be the result of collisions with invasive non-native deer resulting in a range of human injury, including death (a smaller number of deer vehicle collisions also occur with native species).

Each year the cost of damage caused by non-native deer vehicle collisions in Britain is estimated to be in more than £10m.