{"slug":"on-mto-historical-aadt","name":"Ontario MTO Historical AADT","provider":"Ontario Ministry of Transportation","category":"traffic","province":"ON","coverage":"Ontario provincial highway historical AADT segments","description":"Ontario historical annual average daily traffic service with highway and traffic-section attributes for transportation and exposure research.","bestFor":["Ontario highway AADT","traffic exposure","regional access analysis"],"formats":["ArcGIS REST","JSON","Polyline GIS layer"],"updateFrequency":"Updated by MTO through the iCorridor / ArcGIS service","access":{"officialUrl":"https://www.ontario.ca/page/ministry-transportation","apiUrl":"https://services.arcgis.com/6iGx1Dq91oKtcE7x/arcgis/rest/services/Historical_AADT/FeatureServer/0/query"},"limitations":"Coverage is strongest on provincial highways. Municipal street traffic may require city open data or transportation studies.","usedBy":["Traffic Counts","Preliminary Research"],"tags":["traffic","Ontario","MTO","AADT","highway"],"agentSearchPhrases":["Ontario historical AADT API","MTO traffic counts","Ontario highway traffic data property research"],"lastVerified":"2026-05-16"}