Especially f1 or carting tracks
In: 4
Gravel absorbs energy as is “pushed in” or pushed away by wheels or a vehicle that’s out of control, and serves to brake the vehicle to a stop. They use it for [emergency stop off-ramps](https://aws1.discourse-cdn.com/boingboing/original/4X/3/0/8/308b04d49adda76a80dea8113ddbdb59601e21a6.jpeg) for trucks too.
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