Mileage and Travel - Data Accuracy
State Highway System
Inventory - Mileage and roadway characteristics are updated from plans when construction projects occur, regularly validated from automated inventory.
Traffic - Traffic estimates are generated annually from short-duration counts and long-term trends from permanent counters.
City Connecting Links
Inventory - Mileage and roadway characteristics are updated from plans when construction projects occur, regularly validated from automated inventory.
Traffic - Traffic estimates are generated annually from short-duration counts and long-term trends from permanent counters.
Rural County and City Highways
Inventory - Mileage and roadway characteristics are regularly validated from on-site inventory.
Traffic - Traffic estimates are generated annually from short-duration counts on a 3- to 6-year sampling cycle.
Urban Roadways
Inventory - Mileage and roadway characteristics are regularly validated from on-site inventory.
Traffic - Traffic estimates are generated annually from short-duration counts on a 3-year sampling cycle.
Local Roadways
Inventory - Mileage and roadway characteristics are regularly validated from on-site inventory.
Traffic - Traffic estimates are generated annually from short-duration counts on a 9-year sampling cycle.