Mayo County Council is urging drivers to be extra-vigilant on the roads this Autumn, with the Irish deer population at high levels.
Road Safety Officer for Mayo Noel Gibbons said the rutting season begins in October and runs into November, and drivers should beware of deer causing accidents by bolting across roads.
The most common times for the male deer to roam are at dawn and at dusk- coinciding with morning and evening rush-hours.
Motorists are urged to be aware of deer crossing roads in the coming weeks, and be prepared to slow down.
Figures show that between 400 and 500 collisions take place between deer and vehicles in Ireland each year, often resulting in injury for humans and for the animals.