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.