Shifting into low gear while driving can be beneficial in certain circumstances but it is important to understand when and how this should be done. Low gears are most useful for accelerating up a hill, maintaining control on steep downgrades, or improving engine braking. When using low gears, you will want to accelerate slowly to avoid losing traction or spinning the tires. When coming to a stop, shifting into a lower gear allows the engine’s momentum to help slow down the car without putting too much wear on your brakes. However, if you don't shift at all then your vehicle may not slow quickly enough and could become dangerous in some situations. In addition, constantly shifting between high and low speeds can cause extra strain on the transmission system which could lead to costly repairs over time. In general it is best practice to drive mostly in higher gears unless there is an obvious need for more power or torque from a lower gear such as with hills and inclines.