Over-steering. Turning the wheels more sharply than the vehicle can turn. Over-acceleration. Supplying too much power to the drive wheels, causing them to spin. Driving Too Fast. Most serious skids result from driving too fast for road conditions. Drivers who adjust their driving to conditions don't over- accelerate and don't have to over-brake or over- steer from too much speed. 2.19.1 – Drive-wheel Skids By far the most common skid is one in which the rear wheels lose traction through excessive braking or acceleration. Skids caused by acceleration usually happen on ice or snow. Taking your foot off the accelerator can easily stop them. (If it is very slippery, push the clutch in. Otherwise, the engine can keep the wheels from rolling freely and regaining traction) Rear wheel braking skids occur when the rear drive wheels lock. Because locked wheels have less traction than rolling wheels, the rear wheels usually slide sideways in an attempt to "catch up" with the front wheels. Ina bus or straight truck, the vehicle will slide sideways in a "spin out" With vehicles towing trailers, a drive-wheel skid can let the trailer push the towing vehicle sideways, causing a sudden jackknife. See Figure 2.19.