The Knowledge
🚦 Who Really Invented the Modern Traffic Light?
The modern traffic light, largely attributed to Garrett Morgan’s 1923 invention, introduced a critical yellow warning light that improved public safety. Despite his significant impact on traffic systems, Morgan’s contributions have often been overlooked due to historical racism.
Last Updated on February 14, 2026 by Daily News Staff
When you think about the traffic light, you probably picture green for go, red for stop, and maybe a frustrated glance at the yellow. But have you ever stopped to ask: Who actually invented this system we take for granted every day?
The story of the modern traffic light isn’t just about technology—it’s about innovation, public safety, and a Black inventor named Garrett Morgan who changed the way we move through the world.
🔦 Early Traffic Signals: A Dangerous Beginning
Before cars dominated streets, early attempts at traffic control involved manual policing and hand signals. In 1868, the first gas-powered traffic signal was installed in London outside the British Houses of Parliament. Designed by J.P. Knight, a railway engineer, this early signal exploded after just a month due to a gas leak—killing a police officer and abandoning the idea for years.
As cars became more common in the early 20th century, so did traffic jams—and accidents. Cities needed a safer, more efficient solution.
🛠️ Enter Garrett Morgan
In 1923, Garrett Morgan, an African-American inventor and entrepreneur from Cleveland, Ohio, received U.S. Patent No. 1,475,024 for a traffic control device that added a crucial feature: a “warning position” between stop and go. This idea is the basis for today’s yellow light.
His signal was:
- Manually operated
- T-shaped
- Designed to be mounted on a post
- And included a buffer phase to clear intersections before switching direction
This innovation was not only about traffic flow—it was about safety and preventing collisions at a time when automobile fatalities were rapidly increasing.
Morgan sold the rights to his invention to General Electric for $40,000 (equivalent to over $700,000 today), though his contributions were overlooked for decades.
👉 View the full patent on Google Patents
⚙️ Was Morgan the
Only
Inventor?
No. Traffic signal history has multiple contributors:
- Lester Wire, a Salt Lake City policeman, created an electric traffic light prototype in 1912.
- William Ghiglieri patented an automatic signal in 1917.
- Garrett Morgan’s version stood out for its practical innovation—the transitional phase—and for being one of the first widely adopted and commercially viable versions.
In other words, Morgan helped move the traffic light from an experimental device to a nationwide safety standard.
🎥 Watch the Story in 60 Seconds
We break this story down in our latest Forgotten Genius Fridays episode from The Knowledge series on STM Daily News.
📺 Watch “Who Really Invented the Modern Traffic Light?” here: https://youtu.be/cS-emlzhjjk
✊ Why Garrett Morgan Deserves More Recognition
Garrett Morgan’s impact goes far beyond traffic lights. He also invented a gas mask used by firefighters and soldiers, and he launched one of the first Black-owned newspapers in the U.S.
He was a true innovator, working in an era where his contributions were often ignored due to racism. Today, we honor his legacy by telling his story and recognizing how his vision saved countless lives.
🧠 Now you know.
— STM Daily News
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
Few transportation systems in the world are as instantly recognizable as the cable cars of San Francisco. Climbing steep hills with a steady hum and a nostalgic charm, these moving landmarks are more than just a tourist attraction—they’re a triumph of innovation born out of necessity.
🐎 A Problem on the Hills
In the mid-1800s, San Francisco was growing rapidly, but its geography posed a serious challenge. The city’s steep inclines made travel difficult, especially for horse-drawn streetcars, which were the primary form of public transportation at the time.
Horses often struggled to pull heavy loads uphill, and accidents were common. In some cases, animals collapsed under the strain. This dangerous and inefficient system needed a solution.
💡 The Vision of Andrew Hallidie
That solution came from Andrew Smith Hallidie, an engineer and entrepreneur who envisioned a safer, more reliable way to move people through the city.
Hallidie developed a system in which streetcars would be pulled by a continuously moving cable running beneath the street—eliminating the need for horses altogether.
⚙️ The First Cable Car Line
On August 2, 1873, Hallidie launched the world’s first cable car system: the Clay Street Hill Railroad.
This groundbreaking line proved that cable-powered transit could successfully navigate San Francisco’s steep terrain. Instead of relying on animal power, cars used a mechanical grip to latch onto a moving cable underground, allowing them to glide smoothly up and down hills.
The innovation quickly captured public attention—and demand.
🚀 A City Transformed
Following the success of the Clay Street line, cable car systems spread rapidly across San Francisco.
By the late 19th century:
- Dozens of routes crisscrossed the city
- Cable cars became the backbone of urban transportation
- The system helped shape the city’s growth and accessibility
For a time, San Francisco operated the largest and most advanced cable car network in the world.
⚡ The Rise of Electric Streetcars
Despite their success, cable cars faced competition from emerging electric streetcar systems in the early 20th century. Electric trolleys were cheaper to build and operate, and they didn’t require the complex underground cable infrastructure.
The turning point came after the devastating 1906 San Francisco earthquake, which destroyed much of the city—including large portions of the cable car network.
When rebuilding began, many lines were converted to electric systems instead of restoring the older cable technology.
San Francisco’s cable car system, first launched in 1873, remains the last manually operated system of its kind. According to the San Francisco Municipal Transportation Agency (SFMTA) , the system was designed to safely navigate the city’s steep terrain.
The cable cars are now designated as a National Historic Landmark, recognized for their cultural and engineering significance by the National Park Service .
Visitors can explore the history and mechanics of the system at the San Francisco Cable Car Museum , which preserves original equipment and archives.
🛑 Saving a Symbol
By the 1940s, cable cars were on the brink of extinction.
That’s when Friedel Klussmann stepped in. A passionate preservationist, Klussmann led a public campaign to protect the remaining lines from being dismantled.
Her efforts culminated in a successful 1947 voter referendum that ensured the survival of San Francisco’s cable cars—transforming them from everyday transit into a preserved cultural landmark.
🌉 Cable Cars Today
Today, San Francisco’s cable cars are:
- The last manually operated cable car system in the world
- A National Historic Landmark
- One of the most visited attractions in California
Three lines remain in operation:
- Powell–Hyde Line
- Powell–Mason Line
- California Street Line
While they still function as public transit, they now serve as a moving museum—connecting modern riders with the city’s past.
🎯 Why It Matters
San Francisco’s cable cars represent more than a mode of transportation. They tell a story of innovation, resilience, and community action.
From solving a practical problem to becoming a global icon, the cable car system reflects how cities adapt—and how people fight to preserve what makes them unique.
📌 “Now You Know”
San Francisco’s cable cars weren’t built for tourism—they were invented to solve a life-and-death problem on steep city streets. Today, they remain the last system of their kind anywhere in the world.
🔗 External Sources & Related Links
- SFMTA – Cable Cars Overview
- San Francisco Cable Car Museum
- National Park Service – Historic Landmark Info
- Britannica – Cable Car History
- History.com – Invention of Cable Cars
Explore the latest in innovation, AI, gadgets, startups, and digital trends in STM Daily News’ Techsection.
Last Updated on April 2, 2026 by Daily News Staff
🕒 [UPDATE] Orion Performs Translunar Injection Burn
The spacecraft has completed its critical engine burn, sending Artemis II on a trajectory toward the Moon. This marks the official start of its deep space journey.
Artemis II Successfully Launches
CAPE CANAVERAL, Fla. — NASA has successfully launched its Artemis II mission, marking the first crewed journey toward the Moon in more than 50 years.
The powerful Space Launch System (SLS) rocket lifted off from Kennedy Space Center on April 1, carrying four astronauts on a 10-day mission around the Moon and back.
On board are Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist Christina Koch, and Canadian astronaut Jeremy Hansen. The mission is already being hailed as a major milestone in NASA’s effort to return humans to deep space.
Shortly after liftoff, the Orion spacecraft successfully reached orbit and deployed its solar arrays, beginning its journey that will eventually send the crew on a translunar trajectory toward the Moon. 
Artemis II is a lunar flyby mission, meaning astronauts will not land but will travel farther from Earth than any human mission in decades while testing critical systems needed for future landings.
The mission also marks several historic firsts, including the first woman and the first person of color—Victor Glover—to travel into lunar space.
NASA says the mission is a key step toward future lunar landings and long-term plans to establish a human presence on the Moon later this decade.
🛰️ Artemis II Mission Timeline
The 10-day Artemis II mission follows a carefully planned trajectory from Earth to the Moon and back:
- Day 1: Launch and Earth orbit
- Day 1–2: Translunar injection burn
- Days 2–4: Deep space travel
- Days 4–5: Lunar flyby
- Days 5–8: Return to Earth
- Days 9–10: Reentry and splashdown
For official updates and in-depth mission details, visit the following trusted sources:
- NASA: Artemis II Mission Overview
- NASA Artemis Program (Return to the Moon)
- Orion Spacecraft – Mission Details
- Space Launch System (SLS) Rocket Overview
- Kennedy Space Center – Launch Operations
- Watch NASA Live Coverage and Replays
🧾 Sources
- NASA official launch coverage and mission updates
- NASA Artemis II press materials and briefings
- NASA Kennedy Space Center launch operations updates
Stay with STM Daily News for live updates on Artemis II.
LOS ANGELES — Century Boulevard is one of the most recognizable east–west corridors in South Los Angeles, stretching from Watts to Los Angeles International Airport (LAX). But despite its grand-sounding name, the origin of “Century” is surprisingly simple—and rooted in math.
The Meaning Behind “Century”
Century Boulevard sits roughly 100 blocks south of downtown Los Angeles, where the city’s street numbering system begins at 1st Street and Main Street. Instead of naming the road “100th Street,” city planners opted for a more distinctive and memorable name: Century Boulevard.
In this case, “Century” literally means 100.
Part of Los Angeles’ Grid System
Los Angeles was designed using a grid-based street layout, especially in its expanding southern neighborhoods during the early 20th century. Streets were often named or numbered based on their distance from downtown.
Century Boulevard aligns with what would have been the 100th Street corridor—making it a key reference point in the city’s geography.
A Street That Evolved Over Time
Before it became Century Boulevard, portions of the roadway were known by other names, including Pine Avenue and San Antonio Street. As the region developed and expanded, these segments were unified under a single name in the 1920s.
This consolidation helped streamline navigation and supported growing transportation needs.
From Local Road to Global Gateway
The importance of Century Boulevard grew significantly with the rise of Los Angeles International Airport (LAX). Today, it serves as a major gateway for millions of travelers entering the city.
The road connects diverse communities—from historic neighborhoods in South Los Angeles to the bustling airport corridor—making it both a local lifeline and an international entry point.
More Than Just a Name
Century Boulevard reflects a broader pattern in Los Angeles street naming:
- Some streets honor historical figures
- Others reflect geography or culture
- And some, like Century, are rooted in the city’s structured grid system
It’s a reminder that even the most ordinary street names can reveal deeper stories about how a city was built.
The Bottom Line
Century Boulevard isn’t named after an event—it’s named for its location. Positioned at the 100th Street line, it represents both the logic of Los Angeles’ design and the growth of the city over time.
Now you know.
Related External Links
- Century Boulevard – Overview and History
- Los Angeles International Airport (LAX) – Official Website
- Los Angeles City Planning Department
- Los Angeles Public Library: The Story Behind LA Street Names
- LA Metro – Transportation System Information
- Calisphere – Historical Images and Maps of Los Angeles
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
