FIELD NOTE · SUPPLEMENTAL SET
Cut to the wrong dimension: why Lancaster's musical road plays flat
ISSUEDJULY 11, 2026DRAWN BY THE NIGHTLY SWEEP
A dimension got specified one way and cut another. That is the whole story, and it is audible from the driver's seat.
Honda grooved a stretch of Avenue K in downtown Lancaster in 2008 for a Civic commercial. The grooves were supposed to play the William Tell Overture. They do not, quite. The notes come out wrong, and they have been wrong for eighteen years, because the error is not in a setting somebody can adjust. It is cut into the ground.
The tune is made the way a record is. Tires cross evenly spaced grooves and the frequency you hear is how often they arrive.
The trap is d.
Repeat distance is not the gap between grooves. It is the gap plus the width of the groove itself, because that is the distance from the start of one groove to the start of the next. Get a note higher and you shrink d. Shrink the wrong thing and you shrink it by the wrong ratio.
Here is the arithmetic on his worked example. Take a groove 1 inch wide with a 4 inch gap after it. The repeat is 5 inches. Now go for a perfect fourth, which is a frequency ratio of 4 to 3, so the repeat needs to come down by a quarter. Shrink the gap from 4 inches to 3 and the repeat is not 3.75 inches. It is 4 inches, because the groove is still there.
Four over three was wanted. Five over four arrived.
That is a major third instead of a perfect fourth, and the melody opens on exactly that interval.
Every note on that road is speed divided by its own repeat distance. Drive faster and every frequency rises by the same factor. The notes all move together. The distances between them, which is what a melody actually is, do not change at all.
So there is no speed that plays it correctly. Fast, slow, it is the same wrong tune in a different key. The intervals were fixed the moment the saw came off the pavement.
Where the melody should climb an octave, it reaches a major sixth. Simmons-Duffin's read is that the spec reached the crew as a spacing and got measured as a gap, which is a hypothesis about how it happened rather than a documented fact. It is also the most familiar failure on any site.
Then they cut it again. With the same intervals.
CUT TWICE 2008 Honda grooves Avenue K in downtown Lancaster for a Civic commercial, and the intervals come out wrong 2008 Noise complaints follow and the city spends $35,000 to remove and relocate it 2008 It is re-cut outside town, carrying the same interval error it had downtown
Thirty-five thousand dollars bought a change of address. It did not buy a check of the arithmetic. The arithmetic is one line long.
The commercial was fine. Honda's audio was edited so the tune came out right on television, which is the detail that tells you nobody involved was listening to the road. The ad played the overture. The pavement played something else. Both went out the same week.
A dimension means one thing on the drawing and another on the ground. Centre to centre, or clear. Face of stud, or face of finish. Top of curb, or flow line. The word in the middle of the spec is the one that decides, and it is the word that gets left out of the phone call.
Concrete does not forgive that. A framer discovers the misread and shims it. A paving crew discovers it after the saw has run, and the correction is demolition. The road at Lancaster is the pure case: correct workmanship, correct materials, correct everything except which distance the number referred to.
The blind spot here is that it got called a music problem. It was never a music problem. It is a dimensioning problem that happens to be audible, and the reason it is famous is that the failure made a sound. Most of them just sit there being slightly wrong until somebody measures.
For Lancaster and the rest of the Antelope Valley, the ordinary version of this work is grooving, grinding, and saw cutting to a stated tolerance. Filings scored nightly for paving contractors show the surface work while the spec is still a number on a sheet, which is where a paving tolerance is actually decided.
Somebody read four inches and cut four inches. They just measured it from a different edge than the man who wrote it down.
Honda grooved a stretch of Avenue K in downtown Lancaster in 2008 for a Civic commercial. The grooves were supposed to play the William Tell Overture. They do not, quite. The notes come out wrong, and they have been wrong for eighteen years, because the error is not in a setting somebody can adjust. It is cut into the ground.
The tune is made the way a record is. Tires cross evenly spaced grooves and the frequency you hear is how often they arrive.
The formula, and the part that got dropped
Pitch is speed divided by repeat distance. The physicist David Simmons-Duffin worked it out in a December 2008 analysis, and the formula is the ordinary one: f equals v over d.The trap is d.
Repeat distance is not the gap between grooves. It is the gap plus the width of the groove itself, because that is the distance from the start of one groove to the start of the next. Get a note higher and you shrink d. Shrink the wrong thing and you shrink it by the wrong ratio.
Here is the arithmetic on his worked example. Take a groove 1 inch wide with a 4 inch gap after it. The repeat is 5 inches. Now go for a perfect fourth, which is a frequency ratio of 4 to 3, so the repeat needs to come down by a quarter. Shrink the gap from 4 inches to 3 and the repeat is not 3.75 inches. It is 4 inches, because the groove is still there.
Four over three was wanted. Five over four arrived.
That is a major third instead of a perfect fourth, and the melody opens on exactly that interval.
Why speed does not save it
This is the part worth understanding, because it is what makes the mistake permanent.Every note on that road is speed divided by its own repeat distance. Drive faster and every frequency rises by the same factor. The notes all move together. The distances between them, which is what a melody actually is, do not change at all.
So there is no speed that plays it correctly. Fast, slow, it is the same wrong tune in a different key. The intervals were fixed the moment the saw came off the pavement.
Where the melody should climb an octave, it reaches a major sixth. Simmons-Duffin's read is that the spec reached the crew as a spacing and got measured as a gap, which is a hypothesis about how it happened rather than a documented fact. It is also the most familiar failure on any site.
What it cost to move a mistake
Downtown Lancaster did not enjoy living beside it. The complaints worked, and the city spent $35,000 removing the road and relocating it out of town.Then they cut it again. With the same intervals.
CUT TWICE 2008 Honda grooves Avenue K in downtown Lancaster for a Civic commercial, and the intervals come out wrong 2008 Noise complaints follow and the city spends $35,000 to remove and relocate it 2008 It is re-cut outside town, carrying the same interval error it had downtown
Thirty-five thousand dollars bought a change of address. It did not buy a check of the arithmetic. The arithmetic is one line long.
The commercial was fine. Honda's audio was edited so the tune came out right on television, which is the detail that tells you nobody involved was listening to the road. The ad played the overture. The pavement played something else. Both went out the same week.
The tolerance nobody held
There is a version of this on ordinary jobs every week, and it is worth naming because it is the same shape.A dimension means one thing on the drawing and another on the ground. Centre to centre, or clear. Face of stud, or face of finish. Top of curb, or flow line. The word in the middle of the spec is the one that decides, and it is the word that gets left out of the phone call.
Concrete does not forgive that. A framer discovers the misread and shims it. A paving crew discovers it after the saw has run, and the correction is demolition. The road at Lancaster is the pure case: correct workmanship, correct materials, correct everything except which distance the number referred to.
The blind spot here is that it got called a music problem. It was never a music problem. It is a dimensioning problem that happens to be audible, and the reason it is famous is that the failure made a sound. Most of them just sit there being slightly wrong until somebody measures.
For Lancaster and the rest of the Antelope Valley, the ordinary version of this work is grooving, grinding, and saw cutting to a stated tolerance. Filings scored nightly for paving contractors show the surface work while the spec is still a number on a sheet, which is where a paving tolerance is actually decided.
Somebody read four inches and cut four inches. They just measured it from a different edge than the man who wrote it down.