UK Driving Theory Practice Exam 2025 - Free Driving Theory Practice Questions and Study Guide

A stopping distance of 315 feet is typically associated with a speed of 70 mph. This measurement takes into account both the thinking distance and the braking distance required at that speed.

At higher speeds, vehicles require more time and distance to come to a complete stop due to the physics involved, such as momentum. The relationship between speed and stopping distance is not linear; as speed increases, the stopping distance increases at a greater rate. For example, at 30 mph, the stopping distance is significantly less than at 70 mph due to this exponential increase.

The figure of 315 feet aligns with standard stopping distance charts used in driving theory, which are based on research and real-world data about reactions and braking times. Thus, when considering how much distance is needed to stop safely from a speed of 70 mph, 315 feet is an accurate representation of that requirement. Understanding these relationships is crucial for drivers to gauge safe stopping distances based on their speed.