Why do large semis shake your car when you drive past them?
[Vortex shedding](_URL_0_) Because semi's are not very streamlined the air rushing past them ends up in a series of vortices. As these vortices pass you, your car is alternately sucked toward and blown away from–hence the shaking motion.
The Short Answer
[Vortex shedding](_URL_0_) Because semi's are not very streamlined the air rushing past them ends up in a series of vortices. As these vortices pass you, your car is alternately sucked toward and blown away from–hence the shaking motion.
Analysis
Key Concepts: Vortices, vortex, shedding
This explanation focuses on vortices, vortex, shedding and spans 39 words across 2 sentences. At 40% below the average Everyday Life explanation (65 words), the answer takes a direct, no-frills approach — sometimes the simplest explanation is the most effective.
What This Answer Covers
This is a focused, single-point answer that gets directly to the core of the question without detours.
How This Compares in Everyday Life
Ranked #342 of 500 Everyday Life questions by answer depth (top 69%). This is in the concise tier — a focused explanation that prioritizes clarity over exhaustiveness. Many readers prefer this level of directness.
Frequently Asked Questions
Is there a simple explanation for why large semis shake your car when you drive past them?
[Vortex shedding](_URL_0_) Because semi's are not very streamlined the air rushing past them ends up in a series of vortices. As these vortices pass you, your car is alternately sucked toward and blown away from–hence the shaking motion.
How detailed is this explanation compared to similar Everyday Life questions?
This is a focused answer at 39 words, ranked #342 of 500 Everyday Life questions by depth. The key concepts covered are vortices, vortex, shedding.
What approach does this answer take to explain large semis shake your car when you drive past them?
The explanation uses root cause analysis across 39 words. It is categorized under Everyday Life and addresses the question through 1 analytical lens.