MythBusters · Video summary

Can You Actually Outrun a Falling Bridge? | MythBusters

MythBusters Jamie and Adam tackle the classic movie trope of jumping to safety from a collapsing bridge, testing the feasibility of such a feat in both small-scale and full-scale experiments.

MythBusters · August 26, 2026 · 24-min episode · 4-min read

Can You Actually Outrun a Falling Bridge? | MythBusters

Key takeaways

🏃Even with a running start, as depicted in the movie, the small-scale results show that the jump height is significantly reduced, making a safe leap unlikely.04:09
⏱️The small-scale tests reveal that a successful jump from a collapsing bridge is only possible within an extremely narrow window of about 150 milliseconds after the bridge begins to fall.06:01
🏗️The full-scale bridge, weighing 1600 pounds, is constructed with steel cables supporting the wooden planks, ensuring structural integrity for the experiment.07:54
سقوط حرDuring the full-scale jump attempts, the bridge immediately loses tension and goes into free fall the moment its cables are severed, offering no solid surface for a jump.16:32
🚫The MythBusters conclude that there is no 'grace period' or time to react and jump once a suspension bridge begins to collapse.18:59
💥The myth of jumping to safety from a collapsing bridge, as seen in 'Cliffhanger,' is definitively busted, highlighting the difference between cinematic heroics and real-world physics.20:28

Chapters

0:05Introduction to the Cliffhanger Myth
0:37Small-Scale Experiment Setup
3:50Small-Scale Control Jump
4:07Small-Scale Delayed Jumps
7:24Small-Scale Angled Jumps
9:03Small-Scale Results and Conclusion
10:54Building the Full-Scale Bridge
13:55Rigging the Full-Scale Bridge
23:56Jamie's Full-Scale Jump Attempt
28:27Adam's Full-Scale Reflex Jump Attempt
34:05Holding On for Dear Life
38:31Final Verdict: Myth Busted

The digest

The MythBusters, Adam Savage and Jamie Hyneman, delve into a cinematic staple: the hero's daring leap from a disintegrating bridge. Inspired by the climax of the movie "Cliffhanger," where Sylvester Stallone's character makes a seemingly impossible jump after a bomb severs one side of a suspension bridge, the team sets out to determine if such a feat is actually possible in the real world.

Small-Scale Shenanigans: Precision and Milliseconds

Before tackling a full-sized, collapsing bridge, Adam and Jamie opt for a meticulous small-scale experiment. They construct a miniature suspension bridge, complete with a precisely controlled solenoid to sever one of its moorings, simulating the bomb's effect. To represent the hero, they build a gas-powered, pint-sized piston-driven jumper, affectionately dubbed "Mini-Adam." The entire setup is controlled by two timers, allowing for an astonishing one-millisecond precision in coordinating the bridge's destruction and the jumper's leap. This level of control is crucial for identifying any minuscule window of opportunity for a successful jump.

Their initial control test involves Mini-Adam jumping from an unbroken bridge, achieving a respectable 22-inch leap. The real challenge begins when they introduce a delay between the bridge's destruction and the jump. Starting with a 50-millisecond delay, they observe Mini-Adam's jump height significantly reduced to 10 inches. As the delay increases to 100 milliseconds, the jump height further plummets to a mere 4.5 inches. At 150 milliseconds, Mini-Adam barely makes it to the end of the bridge, demonstrating a rapidly diminishing window for a successful jump. Even when the jumper is angled to simulate a running jump, the pattern remains consistent: the longer the delay, the less effective the jump. The small-scale tests suggest that while a life-saving jump might be theoretically possible, the available time is infinitesimally small, less than a sixth of a second.