Workshop › OutRun-style Racer › Step 32 of 44

Traffic moves

What we are doing

The cars drive too: every frame each moves forward by its own speed, wrapping around the track like we do.

```js
for (const car of cars) {
  car.z = (car.z + car.speed) % trackLength
}
```

for (const car of cars) runs once for each car.
(car.z + car.speed) % trackLength moves it on and wraps it around the end of the track.

In update, above position += speed, write the loop followed by an empty line.

Skills: The game loop