Panneaux routiers

A yellow diamond showing a tractor crossing symbol specifically means:

Panneau routier de Île-du-Prince-Édouard — Tractors may cross the road here — slow and expect slow-moving equipment
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Bonne réponse : A. Tractors may cross the road here — slow and expect slow-moving equipment

Mud or crop debris behind a tractor can cause loss of traction or obscure following cars' views.