Before revision: 250px|Wheel chocks placed around an aircraft's landing gear Wheel chocks'' (or chocks ''' ) are wedges of sturdy material placed closely against a vehicle's wheels to prevent accidental movement.
After revision: 250px|Wheel chocks placed around an aircraft's landing gear 'Wheel chocks (or chocks ) are wedges of sturdy material placed closely against a vehicle's wheels to prevent accidental movement.