Your Street Was a Trail First

Look at a map of Manhattan above Houston Street and it's almost insultingly tidy: a ruled grid of numbered streets and numbered avenues, laid down on purpose by the Commissioners' Plan of 1811 to carve the island into sellable rectangles.1 It is one of the most deliberately designed pieces of city on Earth. And running straight through it, ignoring the whole scheme, is one stubborn diagonal: Broadway, slashing across the grid at an angle and tearing open a wedge of leftover public space everywhere it cuts an avenue — Union Square, Madison Square, Herald Square, Times Square.2

Why is Broadway crooked when everything around it is straight? Because Broadway is older than the grid. Its lower course — from the Battery up to about 23rd Street — follows a Lenape footpath that was already there, well-worn, when the Dutch arrived; a Dutch sea captain and colonist named David de Vries noted it in his journal in 1642 as "the Wickquasgeck road over which the Indians passed daily," and the Dutch widened the old trail into the main street of their town — the road we now call Broadway.3 When the 1811 planners drew their perfect grid, they couldn't be bothered to erase the busy street everyone already used, so they left it in — and the grid had to bend around it forever after. (One honest scope, because the romantic version oversells it: only the lower, winding stretch is the inherited trail. And the original trail didn't even vanish at 23rd Street — it veered east, roughly along what is now St. Nicholas Avenue, while the straight upper run of Broadway was laid out later on a fresh line. Broadway is half fossil, half plan.3)

That's the whole essay in one street. The built world looks authored. A surprising amount of it is inherited — and once you can see the seams, you can't unsee them.

Nobody drew the first one

Here's the mechanism, and it's almost embarrassingly simple. A person on foot — or a deer, or a buffalo — does not survey. It doesn't draw a straight line between two points and bulldoze what's in the way. It takes the path of least resistance: around the swamp, along the dry ridge, through the one gap in the hills, down to the shallow place where you can cross the river. That line gets walked enough times to wear in. Then someone rides it. Then it gets graded for carts, then paved for cars, then widened — and at every step, the cheapest thing to do is to follow the line that's already there.

So the crooked street isn't a mistake or a quaint accident. It's an optimization — just not one anybody consciously performed. The first traveler solved the terrain, and every era since has inherited the solution. (Worth saying plainly, because it's easy to get romantic here: the Native trails that became so many American roads weren't aimless wandering or some mystical communion with the land. They were practical, efficient routes between real places — genuine engineering, on foot, that we should credit as such.4)

The cases that actually hold up

This is a genre thick with folklore, so let me earn the idea with examples that survive a fact-check.

The clearest modern one runs through Los Angeles. The 405 freeway climbs over the Santa Monica Mountains through the Sepulveda Pass — and it goes there because that pass is the one practical gap in the range. The Tongva crossed it on foot for centuries; the 1769 Portolá expedition used it; in 1875 ranchers widened it into a wagon road; and the freeway was cut through in 1960–62.5 Each version inherited the same corridor for the same reason: it's the only sane way through. (The freeway needed enormous cuts and earthworks — it is not the literal dirt path. What persisted is the route, not the trail.5)

It happens at mountain gaps everywhere. At the Cumberland Gap, where Kentucky, Virginia, and Tennessee meet, the National Park Service will tell you outright that the buffalo blazed the trail through the gap; bison, then Native nations, then the trail Daniel Boone's party cut in 1775 (widened into a wagon road in 1796), then a modern highway, all threading the same notch in the ridge.6 The Natchez Trace may have begun the same way — a bison trace toward salt licks, an origin inferred from the way its course hugs the ridgelines and dodges the swamps, exactly as a heavy animal seeking the easy grade would.7

And someone saw the whole pattern clearly enough to write it as a poem — in 1895. Sam Walter Foss's "The Calf-Path" tells of a calf ambling crookedly home through the woods; a dog follows its track, then sheep, then men, and over centuries the wandering line is paved into "the crooked highway of a renowned metropolis." His closing couplet has never been bettered:8

It's an allegory, not a survey record — but it's a true one, and we'll see in a minute that economists eventually gave it a name.

First, the myths

Before the real principle, the fakes — because naming them is what makes the real cases trustworthy.

"Boston's streets were laid out by cows." You've heard it; it's charming; it's wrong. Boston's tangle comes from genuinely difficult topography (the original three-hilled Shawmut peninsula), old property lines, piecemeal cart ways, and the slow gluing-together of separate towns over centuries — organic human growth, not livestock. The cow story traces to an Emerson quip — "we say the cows laid out Boston," from his 1860 book The Conduct of Life — a joke pushing 170 years old that hardened into fake history.9

"The railroad gauge comes from Roman war chariots." This is the forwarded-email classic: standard rail gauge is 4 feet 8.5 inches because that's the width of two Roman horses' backsides, and so on. It's a hoax. That gauge — 1,435 mm, now roughly 55% of the world's railways — came from the English colliery wagonways that George Stephenson built his early railways to roughly match. Coal carts, not chariots; northern England, not Rome.10

And the biggest concession of all: most infrastructure really is designed. The Manhattan grid was planned from scratch. So were grid cities the world over and the entire Interstate Highway System. The claim of this essay is not "every road is an old trail" — that's the folklore. The honest claim is narrower and more interesting: where an old route set the line first, the line tends to stick. Broadway is only a great story because it breaks a grid that was otherwise imposed by fiat.

The real principle: path dependence

So why do old routes survive at all, when we have bulldozers and the will to use them? Not magic. Economics.

Once a route exists, things grow up against it. Buildings, property lines, water mains, the addresses of everyone who lives there — all of it assumes the road is where it is. To move the road, you'd have to buy out and demolish everything that crowded in along it, which costs vastly more than just repaving the line you've got. So you repave the line you've got. An early, half-accidental choice gets locked in, because everything built afterward is built on the assumption that it's permanent. Economists call this path dependence, and the foundational paper is Paul David's 1985 "Clio and the Economics of QWERTY."11

The railroad gauge turns out to be the perfect example — a real lock-in wearing a fake origin story. The chariot tale is nonsense, but the gauge genuinely is frozen happenstance: Stephenson's roughly-arbitrary coal-cart width became the planetary standard for no deeper reason than that it went first, and once thousands of miles of track were laid to it, every later mile had to match.10 The keyboard you're reading this on is another — QWERTY locked in by a head start, not by winning a contest. (Whether some other layout would actually be better is genuinely disputed; the famous claims that QWERTY is provably inferior have been challenged. But the lock-in itself — that we kept it because we started with it — isn't in doubt.12)

And the lines really do persist on the scale of millennia. A 2022 study in the Journal of Comparative Economics found that the parts of Europe with the densest network of ancient Roman roads still have the densest modern roads — and measurably more economic activity — two thousand years later (with a telling exception: where the road network was later abandoned, the persistence breaks down, which is the proof that the roads are doing the work).13 The Romans drew a line, and the line is still pulling traffic toward it after the western empire that drew it has been gone for fifteen centuries.

It's happening right now

The best part is that you don't need a time machine to watch this work. Look at any campus lawn or park where a paved walkway turns a corner and people don't — where there's a bare dirt streak worn diagonally across the grass, cutting the corner the pavement refused to cut.

That has a name. It's a desire path — the route chosen by feet, one footstep at a time, voted into the ground by everyone who decided the official way was too long.14 It is the deer track and the calf-path and the Lenape footpath, forming in real time, right in front of you. And some planners have learned the lesson: instead of fighting the desire paths, they wait to see where people actually walk, and then pave those.14

The next sidewalk is being drawn the same way the first road was.

You live in an accreted world

Pull it together and the street signs start to look like the surface of something much deeper. The map around you wasn't authored, the way the Manhattan grid was. Mostly it accreted — layer on layer, each one repaving the one beneath, the freeway over the wagon road over the footpath over the line some animal walked to get home before anyone was keeping records.

The street names will even tell you, if you ask. Wall Street is named for a literal wooden defensive wall the Dutch built in 1653; the wall came down in 1699 and the name stayed.15 Canal Street is named for an actual canal, an early-1800s drainage ditch that was covered over around 1819; the water is gone and the name is a fossil.15 The city is full of these — words that outlived the things they describe, pointing down through the layers to an older world.

So the next time a street bends for no reason you can see, give it the benefit of the doubt. It may not be a mistake. It may be the oldest thing on the map — a line that was the easy way once, walked by something that needed to get somewhere, and kept simply because, once a path exists, it is almost always cheaper to follow it than to start again. The world is older and stranger than its street signs admit. You drive on its memory.