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One-Way Signs: An American History

The American automobile industry emerged at the turn of the 20th century, and one-way streets became popular a few decades later, as the network of roads expanded. A one-way street confines vehicles to one specified direction, in case of overly narrow or busy streets. The first one-way street is believed to have been in Lima, Peru. As one-way streets became common in the United States, the need for one-way street signs arose. Since then,the one-way traffic sign has evolved from a flimsy arrow-shaped piece of wood to a reflective aluminum rectangle, while still retaining its original color scheme and essential design.
The original American one-way sign was a black and white die-cut sign in the shape of an arrow. In 1925, the Traffic Committee of the International Police Conference in New York was the first to propose a standardization of traffic signs and one-way signs.
One-Way signs in 1925
Author's collection: Models recommended by the Traffic Committee of the International Police Conference
It seems that, for a while, sign manufacturing companies took the Traffic Committee’s suggestions to heart. Some of the first Depression era one-way signs from Minnesota’s Lyle Culvert Company (below left) and the Lebanon, New Hampshire-based Niles Machine Company (below right) were designed according to the committee’s specifications.
One-Way Street signs
Author's collection: Niles Machine Company
Lyle Signs
Author's collection: Lyle Signs
For a few decades, the arrow-shaped, one-way sign hung in many streets, and even became a cultural symbol of traffic regulation. In the 1940’s arrow-shaped one-way signs hung in every borough of New York, and became iconic.
Vintage traffic sign history
Comic showing 1940s one-way sign.
One-Way Sign 1960’s or the 1970’s
A one-way sign in downtown LA that is believed to have been erected in the 1960’s or the 1970’s (image courtesy of Eric Richardson of blogdowntown.com/).
One-Way Sign 1977
A white and black one-way sign ready to be unveiled in St. Petersburg, Florida in February of 1977 (image courtesy of St. Petersburg Times Archives).
Eventually, the arrow-shaped sign was phased out in favor of a simpler design that could be more easily and efficiently mass-manufactured. In the 1950’s, sign manufacturers began to revert to a simpler, rectangular design.The simple black and white sign—longer vertically than horizontally—was installed across the nation, from New York to California.
One-Way Sign in 1958
Seattle engineers pressing similar one-way signs in 1958 (image courtesy of Seattle Municipal Archives).
One-Way Sign in 1951
A worker installs new rectangular one-way signs in Toledo, Ohio in 1951 (image courtesy of Toledo Blade Archives).
And by the time Reagan took office, American one-way traffic signs had become completely standardized to reflect the design that peppers today’s roads.
One-Way signs in 1987
A worker installs a one-way sign in Lewiston, Maine in 1987 (image courtesy of The Lewiston Journal Archives).
One-Way Sign in 1992
But getting everyone to follow the sign directions is a task easier said than done, like for these geese. (Image courtesy of Lakeland Ledger).
There is also the issue of visibility. After all, how can you expect drivers to obey a sign if they can’t see it? This becomes an especially large problem at night. At first, sign engineers solved this problem by outfitting their signs with reflective buttons.
Detour Ahead Sign
Detour Ahead sign with reflective buttons.
A close up on the reflective buttons
Close-up of reflective buttons.
Recently, reflective buttons have disappeared; the new generation of one-way signs use metallized glass beads or increasing microscopic plastic prisms to in order to be fully reflective and maximize visibility in all light conditions. Made of durable aluminum and printed in high definition, one-way street signs can appear in a variety of designs, but the standardized design remains the most common—a fixture at street intersections in all 50 states.
The one-way sign has come a long way from its original incarnation, but it has retained its black and white template. The arrow symbol has remained integral to the design. The standards state, "they shall be used to indicate streets or roadways upon which vehicular traffic is allowed to travel in one direction only."
1940-1949
Early one-way arrows were slightly more complicated than the signs we see today, and less standardized, with creative flair showing through.
Classic cross-foot arrow design
Author's collection: Models recommended by the Traffic Committee of the International Police Conference
1950-1959
The arrow shaped one-way sign
A simpler adaptation of the arrow shaped one-way sign with straight angles. New York City, 1950s.
One Way Street Signs posted in 1955
One Way Street Signs posted in 1955, Spokane, Washington.
1960-1969
Evolution of the modern one-way sign, eventually settling on black and white.
The modern design, New York City.
The modern design, New York City.
One-way sign in the 1960s
An alternate one-way sign developed in the 1960s and later phased out.
1970-1979
More alternatives to the standard one-way sign were developed, but most did not last.
Installation one-way sign 1977
Installation of a new one-way sign, Sumter, South Carolina, 1977.
New York City, 1978
New York City, 1978.
1980-present
In the last 35 years, little has changed about the one-way sign, with the exception of new high-visibility materials.
South Carolina, 1980s
South Carolina, 1980s
Modern high-visibility one-way signage
Modern high-visibility one-way signage.

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