In motor racing, a rally marshal is a marshal

Motorsport marshal

Motorsport marshals contribute to more enjoyable, more efficient, and safer motor racing. They are responsible for the safety of competitors and are stationed at various points of danger around race tracks to assist them in case of any collisions, accidents or track problems...

 who is experienced or trained in the area of rallying

Rallying

Rallying, also known as rally racing, is a form of auto racing that takes place on public or private roads with modified production or specially built road-legal cars...

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They hold different duties than a track marshal

Motorsport marshal

Motorsport marshals contribute to more enjoyable, more efficient, and safer motor racing. They are responsible for the safety of competitors and are stationed at various points of danger around race tracks to assist them in case of any collisions, accidents or track problems...

, as they are isolated from other marshals with radio cars spaced out along the length of a stage. They are there for the safety of the competitors, but in spectated rallies, they also may be required to control any spectators that may be posing a safety risk.

Spectators can be of great danger to the drivers than on a track race, and if not aware of the cars they may also put themselves in great danger. Marshals announce the imminent arrival of a car by blowing a whistle to alert the spectators to be ready and to clear the track and sidelines.