The opening Guanajuato spectator stage was cancelled after a metal jump was damaged and started to throw the cars into the air at unexpected angles.
The FIA's 2019 'WRC Safety Action List' has a point dedicated to artificial jumps in which it suggests their dimensions, distance and location on the stage are approved by the governing body and that it can provide a standard specification.
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Source: FIA vows to act on artificial WRC jumps after Mexico