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.