Sharing the road
Two trucks of the same size are traveling at the same speed. One is fully loaded and the other is empty. Which statement is correct?
- The loaded truck will need more distance to stop. Correct answer
- The empty truck will need more distance, because less weight presses on its tires.
- They need the same distance, because only speed affects stopping.
Why
Stopping distance grows with both weight and speed. Here the two trucks share the same speed and differ only in weight, so the loaded one needs more road to come to a stop. The answer about the empty truck's tires has the physics reversed, and the one that says only speed matters drops half of the rule. This is why the handbook warns against slipping in front of a large vehicle and then slowing down or stopping: its driver may not be able to stop in time to avoid hitting you. Truck drivers leave extra room ahead of them for sudden stops, and that gap is theirs to brake into, not a space for you to fill.
Where this comes from
California Driver's Handbook, June 2025 edition. The correct answer is The loaded truck will need more distance to stop.
The rule behind this one
Sharing the road in California goes through the whole topic, with the page of the California Driver's Handbook behind every rule.
More on sharing the road
- You want to get past a large truck on the freeway. What does the handbook tell you to do?
- Raised buttons mark off a space on the road where people wait to board a streetcar. When may you drive through that space?
- You are waiting to turn left across light rail tracks. Which of these is correct?
- You come up behind a road maintenance vehicle with an orange and red triangle on its back. What does the triangle tell you?