How does the stopping distance at 60 mph compare to that at 30 mph?

When comparing stopping distances at different speeds, it's important to understand the relationship between speed and braking distance. The stopping distance is influenced by the square of the speed. This means that if you double the speed, the stopping distance increases by a factor of four, not just double.

At 30 mph, the stopping distance will be significantly shorter than at 60 mph. When calculating these distances, the formula for stopping distance takes into account both the reaction time and the braking distance. As speed increases, both these components contribute to a greater stopping distance.

For example, if we consider that at 30 mph, the stopping distance might be around 60 feet, then at 60 mph, the stopping distance could be around 240 feet, illustrating that the stopping distance is indeed four times greater, not three times or half.

This principle is critical for drivers to understand, as it highlights the importance of maintaining safe following distances and adjusting speeds according to road conditions and traffic. Understanding this concept helps ensure safer driving practices, particularly when encountering changes in speed limits or in emergency situations.