As you travel down a highway, it's important to stay in your lane and not cross over the line and into other traffic. With vehicles traveling at extremely fast speeds, accidentally crossing over the line can create dangerous situations and potential accidents. If you drive on the highway often, you may notice that your vehicle starts drifting in a specific direction. In some cases, this drifting may be a part of the normal road structure, but it may be a problem associated directly with your vehicle.