I'm glad to share with you another free set of Smashicons, this one including 300 pixel perfect icons in 4 styles...
Animal Pictograms on Behance
Set of Thin Line Flat Design Icons of Environment and Green Technology
Set of Thin Line Flat Design Icons of Environment and Green Technology. Download here: http://graphicriver.net/item/set-of-thin-line-flat-design-icons-of-environment-and-green-technology/14788366?ref=ksioks
Car and Road icon set by Dmitriy Miroliubov, via Behance