What effect does excessive speed have on stopping distance?

Answer: C — It increases stopping distance

Excessive speed significantly increases stopping distance due to the physics of motion. When a vehicle is traveling at higher speeds, it requires more time and distance to come to a complete stop. This is largely due to the increased momentum of the vehicle — the faster a vehicle is moving, the more force is involved in bringing it to a halt. The relationship between speed and stopping distance can be understood through basic concepts such as reaction time and braking distance. At higher speeds, the driver has less time to react to obstacles and the braking distance — the distance a car travels after brakes are applied before it stops — also increases significantly. This means that not only does the distance needed to stop become longer, but the time taken for a driver to respond also plays a crucial role, making excessive speed particularly dangerous in terms of stopping distances. In practical terms, when driving in environments where rapid stopping is necessary, such as city driving or in adverse weather conditions, maintaining a speed within safe limits is essential for ensuring the vehicle can be brought to a stop safely. Therefore, excessive speed, contrary to decreasing or having no effect, unequivocally leads to longer stopping distances, highlighting the importance of speed regulation for road safety.