In　recent　years,　with　the　rapid　increase　in　automobile　volume,　vehicle　emissions　have　become　one　of　the　major　emission　sources　of　urban　air　pollution　in　China.　In　China,　most　of　the　national　and　provincial　roads　have　been　the　channels　that　connect　different　cities.　Up　until　2015,　the　length　of　national　and　provincial　roads　have　reached　1.85×105　km　and　3.29×105km,　respectively,　accounting　for　13%　of　the　mileage　of　all　classified　highways.　Therefore,　active　research　on　vehicle　emissions　from　national　and　provincial　roads　between　cities　in　China　is　of　great　significance.　Few　studies　have　been　conducted　on　air　pollutant　emissions　from　intercity　vehicles.　In　this　study,　emission　characteristics　of　intercity　vehicles　were　investigated　based　on　traffic　monitoring　data　and　the　＇calculation　guide　of　air　pollutant　emission　for　road　vehicles＇.　The　results　showed　that　the　CO,　NOx,　PM,　and　HC　emissions　accounted　for　4.5%,　27.9%,　14.4%,　and　7.7%　of　national　vehicle　emissions,　respectively.　There　were　significant　differences　in　emission　contributions　among　different　types　of　intercity　vehicles.　Heavy　trucks　were　major　contributors　to　NOx,　PM10,　and　PM2.5　emissions　and　motorcycles　contributed　most　to　CO　and　HC.　Furthermore,　there　were　significant　differences　in　emission　contributions　of　vehicle　types　on　different　road　types;　the　major　contributor　of　CO　and　HC　emissions　was　small　passenger　cars　on　expressways.　Motorcycles　were　the　main　contributors　to　CO　and　HC　emissions　on　ordinary　roads.　©　2017,　Science　Press.　All　right　reserved.