 The Hattiesburg section begins at an interchange with Interstate 59 ( I @-@ 59 ) and US 98 in Hattiesburg , Lamar County , where the road continues west as part of US 98 . From this interchange , MS 198 heads east into Forrest County on Hardy Street , a four @-@ lane divided highway that passes several businesses . The highway passes to the south of the University of Southern Mississippi before ending at an intersection with US 49 . Past this intersection , Hardy Street continues east as a four @-@ lane undivided city street . 
