From WordNet (r) 3.0 (2006) [wn]:
roadside
n 1: edge of a way or road or path; "flowers along the wayside"
[syn: wayside, roadside]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Roadside \Road"side`\, n.
Land adjoining a road or highway; the part of a road or
highway that borders the traveled part. Also used ajectively.
[1913 Webster]