The rover must avoid having its wheels caught in the airbag material or falling off a sharp incline.

Felix swore as a wheel caught on a log.

The invention of grooved rail enabled tramways to be laid without causing a nuisance to other road users, except unsuspecting cyclists, who could get their wheels caught in the groove.

The smaller car's right-side wheels caught on the curb and the GEO overturned before both vehicles came to rest on the sidewalk, locked in a twisted metallic embrace.

As the rock drove the back of the wagon sideways, the iron rim of the rear wheel caught in a frozen rut beneath the snow and the spokes of the rear wheel snapped.

Uncertainly, Mose looked from the sergeant to Scarlett and she, splashing through the mud, close to the passing wheels, caught at Moses' stirrup strap.

While his attention was on the leak, the engine had veered toward the house, and he corrected with the tiller, overdoing the change in direction so much that the engine lurched as the heavy wheel caught in softer soil on the edge of the lane.

Tram tracks can be hazardous for cyclists, as bikes, particularly those with narrow tyres, may get their wheels caught in the track grooves.

Pulling it uphill was bad enough, as the wheels caught in potholes and ruts and it took all of us to get it free, but hanging on to it downhill was even harder.

People "are afraid of their wheels being caught," he said.