I live in a heavy deer area , the best thing you can do is train yourself to look on each side of the road as far as you can see then scan your way back it takes time to get use to this and you have to be extremly alert , at nite you will need to be more alert also dawn and dusk ,deer tend to move more at these times ,but if you can train your eye to continusly scan the sides of the road you will learn how to spot them , at nite there eyes reflect yellow and you can pick up on this ,and also 9 x out of 10 a deer will continue in his path another words deer rarly turn around , if they have in there mind to cross there going across the road .I would invest in some good lites that reach out and lite the sides of the road rather then somthing I know that does not work.