Peak hour on-system congestion maps
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Peak hour on-system congestion maps

Calculation method

TxDOT created the car-space method to calculate the space between cars in one mile increments, factoring:

  • Number of lanes.
  • Annual average daily traffic (AADT).
  • Percentage of trucks.
  • Average car length.

The calculated space between cars is categorized to illustrate levels of congestion.

This map series is updated annually, typically mid-summer, following the publication of end-of-year data from the previous calendar year.

Peak hour on-system congestion maps

Base year Forecast year
2021 2041
2020 2040
2019 2039
2018 2038
2017 2037
2016 2036
2015 2035