Traffic Census Program
Traffic Counts or Traffic Volumes are for the State Highway System only (in various formats).
Highways are signed as Interstate, California State Route, or United States Route. See examples below:
Traffic count information for city and county streets may be found at the city Traffic Engineering or Public Works Department, or the Community Development Office in the area where the street is located.
Explanation of Traffic Counts (Back & Ahead Leg Diagrams) (PDF)
Traffic Counts are summarized annually into four categories:
| Traffic Volumes: Annual Average Daily Traffic (AADT) For ALL vehicles on California State Highways All files are .XLSX |
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| 2021 AADT | 2022 AADT | N/A | N/A | N/A |
| 2016 AADT | 2017 AADT | 2018 AADT | 2019 AADT | 2020 AADT |
| N/A | N/A | 2013 AADT | 2014 AADT | 2015 AADT |
by Webpage: 2017
| Truck Traffic: Annual Average Daily Truck Traffic For truck traffic on California State Highways All files are .XLSX |
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| 2021 AADT Truck | 2022 AADT Truck | N/A | N/A | N/A |
| 2016 AADT Truck | 2017 AADT Truck | 2018 AADT Truck | 2019 AADT Truck | 2020 AADT Truck |
| N/A | N/A | 2013 AADT Truck | 2014 AADT Truck | 2015 AADT Truck |
| Ramp Volumes For ramp volumes on California State Freeways, by Caltrans District 2020-2017 files are .XLSX and 2016 files are .PDF |
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| District 1 | District 2 | District 3 | District 4 | District 5 | District 6 |
| 2022 D1 | 2022 D2 | 2022 D3 | 2022 D4 | 2022 D5 | 2022 D6 |
| 2021 D1 | 2021 D2 | 2021 D3 | 2021 D4 | 2021 D5 | 2021 D6 |
| 2020 D1 | 2020 D2 | 2020 D3 | 2020 D4 | 2020 D5 | 2020 D6 |
| 2019 D1 | 2019 D2 | 2019 D3 | 2019 D4 | 2019 D5 | 2019 D6 |
| 2018 D1 | 2018 D2 | 2018 D3 | 2018 D4 | 2018 D5 | 2018 D6 |
| 2017 D1 | 2017 D2 | 2017 D3 | 2017 D4 | 2017 D5 | 2017 D6 |
| 2016 D1 | 2016 D2 | 2016 D3 | 2016 D4 | 2016 D5 | 2016 D6 |
| District 7 | District 8 | District 9 | District 10 | District 11 | District 12 |
| 2022 D7 | 2022 D8 | 2022 D9 | 2022 D10 | 2022 D11 | 2022 D12 |
| 2021 D7 | 2021 D8 | 2021 D9 | 2021 D10 | 2021 D11 | 2021 D12 |
| 2020 D7 | 2020 D8 | 2020 D9 | 2020 D10 | 2020 D11 | 2020 D12 |
| 2019 D7 | 2019 D8 | 2019 D9 | 2019 D10 | 2019 D11 | 2019 D12 |
| 2018 D7 | 2018 D8 | 2018 D9 | 2018 D10 | 2018 D11 | 2018 D12 |
| 2017 D7 | 2017 D8 | 2017 D9 | 2017 D10 | 2017 D11 | 2017 D12 |
| 2016 D7 | 2016 D8 | 2016 D9 | 2016 D10 | 2016 D11 | 2016 D12 |
| Peak Hour Volume Data Hourly volume relationships and traffic monitoring sites on the State Highway System. Morning (AM) and evening (PM) peak periods are expressed as a percentage of AADT All files are .XLSX |
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| 2021 | 2022 | N/A | N/A | N/A |
| 2016 | 2017 | 2018 | 2019 | 2020 |
| N/A | N/A | N/A | 2014 | 2015 |
Peak Hour Definitions K and D Factors (PDF)
For questions regarding AADT reports, Ramp Volumes, or the Peak Hour Volume Data Reports above, please contact Hasib Mohabbat.
For AADT GIS data, visit the Caltrans GIS Data webpage.