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| Name | Category | Data type | Description |
|
| Ground truth volumes | | | |
| CCS traffic counts | | Integer (≥0) | Hourly traffic counts from continuous count stations |
| Input data features | | | |
| Probe counts (weight class 1) | Probe counts | Integer (≥0) | Number of unique probe counts from weight class 1 vehicles (<14k lbs) |
| Probe counts (weight class 2) | Integer (≥0) | Number of unique probe counts from weight class 2 vehicles (14k–26k lbs) |
| Probe counts (weight class 3) | Integer (≥0) | Number of unique probe counts from weight class 3 vehicles (>26k lbs) |
| Probe count null flag | Binary (0, 1) | Indicator variable used to identify persistent missing probe data |
| Avg probe speed | Probe speeds | Float (≥ 0) | Average (harmonic) probe speed over 1 hour time period (mph) |
| Reference speed | Float (≥ 0) | Estimated freeflow speed for segment (mph) |
| Avg travel time | Float (>0) | Avg time to travel across segment (seconds) |
| Probe speed null flag | Binary (0, 1) | Indicator variable used to identify persistent missing probe speed/travel times |
| Temperature | Weather | Float (≥ 0) | Temperature in degrees Fahrenheit |
| Temperature null flag | Binary (0, 1) | Indicator variable used to identify whether temperature is missing |
| Dewpoint | Float (≥ 0) | Dew point in degrees Fahrenheit |
| Dewpoint null flag | Binary (0, 1) | Indicator variable used to identify whether dewpoint is missing |
| Relative humidity | Float (≥ 0) | Relative humidity (%) |
| Relative humidity null flag | Binary (0, 1) | Indicator variable used to identify whether relative humidity is missing |
| Visibility | Float (≥ 0) | Visibility (miles) |
| Visibility null flag | Binary (0, 1) | Indicator variable used to identify whether visibility is missing |
| Precipitation | Float (≥ 0) | Precipitation (inches) |
| Precipitation null flag | Binary (0, 1) | Indicator variable used to identify whether precipitation is missing |
| Segment length | Road characteristics | Float (≥0) | Length of segment in miles |
| OSM road class | Binary (0, 1) | 6 one-hot encoded variables representing possible OpenStreetMap road classes |
| OSM lanes | Float (≥0) | OSM-based estimate of number of directional lanes on the road |
| OSM lanes null flag | Binary (0, 1) | Indicator variable used to identify whether OSM lanes is missing |
| Structure type | Categorical | Indicates presence of a special facility (bridge, tunnel, causeway) |
| HPMS through lanes | Float (≥0) | HPMS-based estimate of number of total lanes on the road |
| Functional system (HPMS) | Binary (0, 1) | 3 one-hot encoded variables for HPMS functional classes 1, 2, 3+ |
| Functional road class (TMC) | Binary (0, 1) | 3 one-hot encoded variables for TMC functional classes 1, 2, 3+ |
| AADT | Float (≥0) | HPMS annual avg daily traffic associated with TMC segment |
| AADT (single) | Float (≥0) | Single-unit truck and bus AADT associated with TMC segment |
| AADT (combination) | Float (≥0) | Combination truck AADT associated with TMC segment |
| Hour | Temporal | Binary (0, 1) | 24 one-hot encoded variables representing hours 0–23 |
| Weekend | Binary (0, 1) | 2 one-hot encoded variables for identifying Saturday and Sunday |
| Volume profile estimate | Other | Float (≥0) | Time-of-day volume estimate based on TTI profiling method |
| Volume profile null flag | Binary (0, 1) | Indicator variable used to identify whether volume profile estimate is missing |
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