> ## Documentation Index
> Fetch the complete documentation index at: https://offthepace.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# int_track_evolution

> Track temperature and grip evolution over race.

<Note>Part of the [Pace Baselines](/transform/families/pace-baselines) family.</Note>

Track temperature and grip evolution over race. Grain is (race\_year, race\_id, lap\_number). Tracks ambient and track surface temperature, and grip envelope changes over the race due to rubber lay-down and fuel load shedding.

## Lineage

```mermaid theme={null}
flowchart LR
  int_field_pace_curve --> int_track_evolution
  stg_weather --> int_track_evolution
  int_track_evolution --> int_constructor_structural_pace
  int_track_evolution --> int_dirty_air_tax_component
  int_track_evolution --> int_driver_race_skill_loro
  int_track_evolution --> int_lap_normalized_pace
  int_track_evolution --> int_lap_residual_decomposed
  int_track_evolution --> int_lap_residual_decomposed_qualifying
  int_track_evolution --> mart_corner_skill_driver
  style int_track_evolution fill:#e40404,stroke:#e40404,color:#fff
```

## Overview

| Property          | Value                                                                                 |
| ----------------- | ------------------------------------------------------------------------------------- |
| Layer             | `intermediate`                                                                        |
| Family            | [Pace Baselines](/transform/families/pace-baselines)                                  |
| Contract enforced | No                                                                                    |
| Upstream          | [`int_field_pace_curve`](./int_field_pace_curve), [`stg_weather`](../stg/stg_weather) |

**5 tests** [guard](/transform/ci/overview) this model  -  3 generic, 2 singular.

## Columns

| Column       | Type | Nullable | Tests                                  | Description            |
| ------------ | ---- | -------- | -------------------------------------- | ---------------------- |
| `race_year`  |      | Yes      | [`not_null`](/transform/ci/structural) | Race year              |
| `race_id`    |      | Yes      | [`not_null`](/transform/ci/structural) | Race identifier        |
| `lap_number` |      | Yes      | [`not_null`](/transform/ci/structural) | Lap number within race |