The　goal　of　the　research　was　to　study　one　of　the　most　important　effects　of　first　class　highway　operating　efficiency-roadside　interference.　First　Class　highway　is　a　special　type　of　road,　which　is　unknown　in　other　countries;　they　are　similar　to　multi-lane　road.　In　this　research,　operating　speed　on　First　Class　highway　is　analyzed　based　on　the　peculiar　influencing　factor-roadside　interference　in　China.　This　factor　did　not　exist　when　the　first　class　highway　was　built;　however　with　the　rapid　development　of　the　Chinese　economy,　the　scope　of　the　city　is　increasing　gradually.　The　surrounding　environment　of　the　highway　has　been　changed　time　to　time.　So,　the　roadside　interference　(such　as　pedestrians,　bicycles,　etc.)　changes　the　original　function　of　the　highway.　In　order　to　collect　enough　data,　the　experimental　study　includes　two　aspects:　subjective　and　objective　method.　According　to　the　influencing　degree　of　roadside　interference　on　operation　efficiency,　the　roadside　classification　is　achieved,　which　can　be　theoretical　reference　for　First　Class　highway　construction　in　the　future.　©　2010　ASCE.