{"id":364,"title":"Why California's musical road sounds terrible","description":"Tom Scott visits the \"Musical Road\" in Lancaster, California, a stretch of highway with grooves designed to play the William Tell Overture when driven over at 55 mph. He demonstrates that the road is horribly out of tune and proceeds to explain the physics behind how it should work. The video reveals that the problem stems from a simple but critical miscalculation: the engineers failed to account for the width of the grooves themselves in their spacing measurements. In a final ironic twist, Scott explains this is the second version of the road, rebuilt with the exact same mistake after the first was removed due to noise complaints.","slug":"why-california-s-musical-road-sounds-terrible","creator":"TomScottGo","duration":208.190113,"tags":["Tom Scott","Amazing Places","musical road","Lancaster California","civil engineering","physics","acoustics","engineering mistake","William Tell Overture","road trip","science communication"],"transcription":"If you drive down a certain stretch of highway in the California desert, you will hear music. It's supposed to sound a little bit like this. But instead, it sounds like this. That was the musical road of Lancaster, California. And as you may have heard, it's a little bit out of tune. A lot of money was spent on that road. It was a publicity stunt for a car company who wanted to show off how clever they are. And doing the calculations for something like that isn't really difficult. A musical note is a vibration in the air at a particular frequency. And those vibrations can be made by a violin string or synthesized by a computer, or in this case, made by vehicle tires hitting grooves in the road. The closer the grooves are, the faster the vibrations, and the higher the note. So take the speed limit, divide by the frequency of the note you want, and that's how often there should be a groove in the road. And if people travel at the wrong speed, well, it shouldn't really matter. It'll just be like slowing down or speeding up any other bit of music. It'll be in the wrong key, but it'll still sound right to most people's ears. It won't sound like that mess. So, uh, what went wrong? At this point, I am indebted to David Simmons-Duffin, an assistant professor of physics at Caltech, whose interests include quantum field theories and playing baroque violin, because he was, as far as I can tell, the very first person to figure out what went wrong. And the problem was probably the English language. Whoever did the calculations said that the grooves should be so far apart, let's say four inches for the first note. And they meant that there should be a groove every four inches. But whoever gave the instructions to the work crew said that the grooves should be four inches apart. And that was interpreted as four inches between the end of one groove and the start of the next one. They didn't include the width of the groove itself. But your ears definitely do include it. The highest note on that section of the William Tell Overture should be one octave higher than the lowest. That means the frequency should be doubled and the grooves should be half the distance apart, and they are, if you don't include the width of the groove itself. That error means that every note is distorted, not by a fraction of its value, like if you're traveling at the wrong speed, but by a constant amount, by the width of the grooves. The higher the note, the greater the effect of that distortion. And the result is the mess that you are about to hear for a second time. And the really strange part, this is the second musical road built in Lancaster, California. The first one, built by the car company, was too close to residents who complained about the constant noise and probably this note here. So the city paved over it and rebuilt it to the exact same wrong blueprints. That's a take. That is a take right there. And in order to celebrate that take, I'm going to put my foot down. This is an SUV. It doesn't, it doesn't do that.","timeline":[{"t":0,"speech":"If you drive down a certain stretch of highway in the California desert, you will hear music.","visual":{"action":"A man is driving a car and speaking directly to a camera mounted on the passenger side.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver is in sharp focus, the background is slightly blurred due to motion.","framing":"medium shot"},"mood":"Informative and intriguing.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"},{"color":"black","name":"dashboard","position":"bottom-right","state":"static"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"jeans (implied)","footwear":"","top":"maroon t-shirt"},"face":"speaking, neutral expression","hair":"short, light brown/blond","hands":"left hand on steering wheel, right hand gesturing","pose":"sitting in driver's seat, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert landscape and highway visible through the car windows, moving quickly.","lighting":"Bright, natural daylight from the front and side.","location":"Inside a moving car on a highway"},"text_on_screen":[]}},{"t":4,"speech":"It's supposed to sound a little bit like this.","visual":{"action":"The man continues speaking and driving, gesturing with his right hand.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver is in sharp focus.","framing":"medium shot"},"mood":"Explanatory.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"speaking, looking at camera","hair":"short, light brown/blond","hands":"both hands on steering wheel, then right hand gestures","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway seen through the car windows.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":8,"speech":"","visual":{"action":"A montage of shots showing the car driving on the highway, set to the intended music.","colors":{"dominant":"gray","palette":["gray","silver","yellow","light green","pale blue"]},"composition":{"angle":"low angle, mounted near the front wheel","focus":"The road and the spinning wheel are in focus.","framing":"close-up"},"mood":"Upbeat, triumphant (matching the music).","objects":[{"color":"silver","name":"car wheel","position":"right side of frame","state":"spinning rapidly"},{"color":"yellow","name":"road lines","position":"center-left","state":"passing quickly"}],"people":[],"setting":{"architecture":"","background":"Desert landscape in the distance.","lighting":"Harsh, bright daylight.","location":"Desert highway in California"},"text_on_screen":[{"content":"William Tell Overture\nRossini","location":"top-left","style":"White text on a semi-transparent black banner"}]}},{"t":13,"speech":"But instead, it sounds like this.","visual":{"action":"The man finishes his sentence and the car begins to drive over a section of road with visible grooves.","colors":{"dominant":"beige","palette":["beige","gray","pale blue","light green","black"]},"composition":{"angle":"eye-level, from inside the car","focus":"The road ahead is in focus.","framing":"wide shot (POV from driver's seat)"},"mood":"Anticipatory, setting up a contrast.","objects":[{"color":"black","name":"car hood","position":"bottom of frame","state":"static"},{"color":"light green","name":"trees","position":"left side of road","state":"passing"}],"people":[],"setting":{"architecture":"","background":"Flat desert landscape stretching to the horizon.","lighting":"Bright, direct sunlight.","location":"The Musical Road, Lancaster, California"},"text_on_screen":[]}},{"t":20,"speech":"","visual":{"action":"The car drives over the grooved road, producing a discordant, out-of-tune melody.","colors":{"dominant":"gray","palette":["gray","beige","pale blue","light green","dark gray"]},"composition":{"angle":"eye-level, from inside the car","focus":"The road ahead.","framing":"wide shot (POV)"},"mood":"Dissonant, slightly comical, and jarring.","objects":[{"color":"gray","name":"grooved pavement","position":"center","state":"being driven over"}],"people":[],"setting":{"architecture":"","background":"Desert landscape.","lighting":"Bright daylight.","location":"The Musical Road, Lancaster, California"},"text_on_screen":[]}},{"t":31,"speech":"That was the musical road of Lancaster, California.","visual":{"action":"The man drives and speaks, pointing over his shoulder with his thumb.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale 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It was a publicity stunt for a car company who wanted to show off how clever they are.","visual":{"action":"The man continues driving and explaining the origin of the road.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Explanatory, slightly cynical.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"serious, speaking","hair":"short, light brown/blond","hands":"both hands on the steering wheel","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":48,"speech":"A musical note is a vibration in the air at a particular frequency.","visual":{"action":"The man turns off the main road and begins to explain the physics of sound.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Educational.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being turned"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"focused, speaking","hair":"short, light brown/blond","hands":"turning the steering wheel","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Highway intersection.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":58,"speech":"or in this case, made by vehicle tires hitting grooves in the road.","visual":{"action":"The man explains how the musical road creates sound, gesturing with his hands.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Informative, engaging.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"expressive, speaking","hair":"short, light brown/blond","hands":"gesturing to explain a concept","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":105,"speech":"So take the speed limit, divide by the frequency of the note you want, and that's how often there should be a groove in the road.","visual":{"action":"The man explains the calculation for the groove spacing.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Scientific, clear.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"speaking clearly","hair":"short, light brown/blond","hands":"gesturing with right hand","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[{"content":"55mph","location":"left-center","style":"Large white text"},{"content":"24.6m/s / 440Hz = 0.056m = 5.6cm","location":"left-center","style":"Large white text showing a physics calculation"}]}},{"t":113,"speech":"well, it shouldn't really matter. It'll just be like slowing down or speeding up any other bit of music.","visual":{"action":"The man explains that driving at the wrong speed would change the key, but not cause the dissonance heard.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Analytical.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"thoughtful, speaking","hair":"short, light brown/blond","hands":"gesturing with right hand","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":125,"speech":"So, uh, what went wrong?","visual":{"action":"The man poses the central question of the video, looking directly at the camera.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Inquisitive, leading.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"questioning expression, eyebrows raised slightly","hair":"short, light brown/blond","hands":"right hand gesturing","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":130,"speech":"to David Simmons-Duffin, an assistant professor of physics at Caltech, whose interests include quantum field theories and playing baroque violin,","visual":{"action":"The man credits the physicist who solved the mystery, gesturing with his hands as if presenting information.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Academic, respectful.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"speaking, looking slightly off-camera","hair":"short, light brown/blond","hands":"both hands up in a dismissive or framing gesture","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":142,"speech":"And the problem was probably the English language.","visual":{"action":"The man reveals the surprising root cause of the error.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Revelatory, slightly ironic.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"serious, making a point","hair":"short, light brown/blond","hands":"both hands on the steering wheel","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":152,"speech":"And they meant that there should be a groove every four inches. But whoever gave the instructions to the work crew said that the grooves should be four inches apart.","visual":{"action":"The man explains the specific linguistic misunderstanding between the engineers and the construction crew.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Explanatory, detailing the mistake.","objects":[{"color":"black","name":"steering wheel","position":"center-left","state":"being held"}],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"speaking emphatically","hair":"short, light brown/blond","hands":"gesturing with right hand","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":160,"speech":"And that was interpreted as four inches between the end of one groove and the start of the next one. They didn't include the width of the groove itself.","visual":{"action":"The man clarifies the error: the space between grooves was measured, not the distance from center-to-center.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Precise, analytical.","objects":[],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"serious, explaining","hair":"short, light brown/blond","hands":"both hands on the steering wheel","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":170,"speech":"That means the frequency should be doubled and the grooves should be half the distance apart, and they are, if you don't include the width of the groove itself.","visual":{"action":"A split-screen graphic illustrates the correct vs. incorrect measurement of the grooves.","colors":{"dominant":"gray","palette":["dark gray","light gray","white","red"]},"composition":{"angle":"overhead","focus":"The entire graphic is in focus.","framing":"close-up"},"mood":"Visually explanatory.","objects":[{"color":"gray","name":"road grooves","position":"both sides of screen","state":"static graphic"}],"people":[],"setting":{"architecture":"","background":"N/A - graphic overlay","lighting":"N/A - graphic overlay","location":"N/A - graphic overlay"},"text_on_screen":[{"content":"Red dotted lines and white measurement bars illustrating the spacing.","location":"center","style":"Diagrammatic overlay"}]}},{"t":180,"speech":"That error means that every note is distorted, not by a fraction of its value, like if you're traveling at the wrong speed, but by a constant amount, by the width of the grooves.","visual":{"action":"The man explains the consequence of the error: a constant distortion, not a proportional one.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale blue"]},"composition":{"angle":"eye-level","focus":"The driver.","framing":"medium shot"},"mood":"Conclusive, summarizing the physics.","objects":[],"people":[{"age_range":"30s","clothing":{"accessories":"seatbelt","bottom":"","footwear":"","top":"maroon t-shirt"},"face":"speaking, looking at camera","hair":"short, light brown/blond","hands":"gesturing with right hand","pose":"sitting, driving","position":"left side of frame"}],"setting":{"architecture":"","background":"Desert highway.","lighting":"Bright daylight.","location":"Inside a moving car"},"text_on_screen":[]}},{"t":190,"speech":"And the really strange part, this is the second musical road built in Lancaster, California.","visual":{"action":"The man delivers the final ironic twist of the story.","colors":{"dominant":"gray","palette":["gray","maroon","beige","black","pale 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