If you’ve been driving through U.S. cities and towns, you’ve likely noticed an increase in roundabouts replacing traditional four-way intersections. Some drivers embrace them as an efficient traffic solution, while others find them confusing or even intimidating.
But what exactly is a roundabout, and why is it becoming a preferred alternative to stop signs and traffic signals? Roundabouts are not just about traffic flow—they are a safer, more efficient, and environmentally friendly way to design roads.
Let’s break down what roundabouts are, how they work, and why they are considered one of the most effective traffic management solutions today.
What is a Roundabout? Understanding the Basics
A roundabout—also known as a rotary or traffic circle—is a circular intersection where vehicles move counterclockwise around a central island. Unlike traditional intersections controlled by stop signs or traffic lights, roundabouts operate using a yield-at-entry system, meaning:
✔ Drivers entering the roundabout must yield to vehicles already circulating.
✔ Traffic flows continuously, reducing congestion and unnecessary stops.
✔ Speeds are naturally reduced, leading to safer driving conditions.
Most roundabouts also include:
🔹 Splitter islands – Raised medians that help slow down traffic before entering.
🔹 Pedestrian crosswalks – Positioned away from the central island to increase safety.
🔹 Lane markings – Clear indicators help guide drivers into the correct exit lane.
The result? A smoother, safer, and more efficient intersection that reduces both traffic delays and accidents.
A Brief History of Roundabouts
Many people assume roundabouts are a modern innovation, but their history dates back hundreds of years.
Video : Roundabout Safety Benefits
- 1700s – Early versions of circular intersections appeared in Europe, particularly in England and France.
- 1800s-1900s – Washington, D.C. was designed with multiple traffic circles, inspired by European models.
- 1950s – The United Kingdom introduced the yield-at-entry rule, transforming roundabouts into the efficient system we use today.
- 1990s – The first modern roundabout in the U.S. was built in Summerlin, Nevada in 1990.
- Today – Over 10,000 roundabouts exist in the United States, with more being installed every year.
While roundabouts have been common in Europe and Australia for decades, the U.S. is now rapidly adopting them due to their proven safety and efficiency benefits.
Why Roundabouts Are Safer Than Traditional Intersections
One of the biggest reasons cities are replacing traditional intersections with roundabouts is safety.
1. Fewer Conflict Points = Fewer Accidents
A typical four-way intersection has 32 conflict points—areas where vehicle paths cross, increasing the risk of collisions. In contrast, a roundabout reduces conflict points to just 8.
This means:
✔ No head-on collisions
✔ No dangerous T-bone crashes
✔ Fewer high-speed impacts
According to the Federal Highway Administration (FHWA), roundabouts can reduce serious and fatal crashes by up to 90% when replacing a stop-controlled intersection. Even when replacing a traffic signal intersection, they reduce serious crashes by nearly 80%.
2. Lower Speeds = Less Severe Collisions
In a roundabout, vehicles enter and exit at lower speeds (15-25 mph), compared to the higher speeds (40-50 mph) seen at traditional intersections.
Lower speeds lead to:
✔ Less severe crashes
✔ Fewer pedestrian injuries
✔ Easier decision-making for drivers
3. Safer for Pedestrians and Cyclists
Roundabouts offer better protection for pedestrians because:
✔ Crosswalks are set back from the circular flow, allowing drivers to see pedestrians clearly.
✔ Pedestrians only cross one direction of traffic at a time, making crossings safer.
✔ Cyclists can either merge into traffic or use a designated bike path, depending on the design.
With these safety features, roundabouts significantly reduce pedestrian-related accidents compared to traditional intersections.
Efficiency: Why Roundabouts Improve Traffic Flow
Beyond safety, roundabouts are also more efficient than stop signs or traffic lights.
1. Less Waiting, More Moving
At a traditional intersection, cars must stop at red lights, even when there’s no cross traffic. In a roundabout:
✔ Traffic keeps moving – No unnecessary stops.
✔ Fewer backups – No long wait times during rush hour.
✔ Reduced driver frustration – No more waiting for a green light when there’s no oncoming traffic.
2. Eliminating Left Turns = Smoother Flow
One of the most dangerous and disruptive movements at an intersection is the left turn. Roundabouts eliminate left turns, forcing all vehicles to move in the same direction, improving:
✔ Traffic efficiency – No waiting for gaps in oncoming traffic.
✔ Driver decision-making – No confusion about when to turn.
3. Roundabouts Handle High Traffic Volumes Better
Unlike stop signs and traffic lights, which cause congestion during peak hours, roundabouts allow continuous movement, making them ideal for high-traffic areas.
Environmental Benefits: How Roundabouts Help the Planet
Roundabouts aren’t just safer and more efficient—they also have environmental advantages.
1. Reduced Fuel Consumption
✔ Less idling at red lights = less wasted fuel
✔ Lower speeds = better fuel efficiency
According to studies, roundabouts can reduce fuel consumption by up to 30%, making them a cost-effective solution for drivers.
2. Lower Carbon Emissions
Fewer stops and starts mean lower emissions, helping reduce air pollution in urban areas. Cities that replace signalized intersections with roundabouts see:
✔ Less smog and pollution
✔ Improved air quality
3. Less Road Maintenance Required
✔ No traffic signals = lower maintenance costs
✔ Roundabouts last longer than traffic lights
With less infrastructure to maintain, roundabouts save cities money in the long run.
Challenges: Why Some Drivers Struggle with Roundabouts
Despite their many benefits, some drivers remain hesitant about roundabouts. Common challenges include:
🚦 Confusion about yielding – Some drivers don’t understand that they must yield to circulating traffic before entering.
🚦 Merging issues – Drivers unfamiliar with roundabouts sometimes hesitate, causing unnecessary slowdowns.
🚦 Exit mistakes – Some drivers find it difficult to choose the correct exit and miss their turn.
However, studies show that once drivers become familiar with roundabouts, their confidence improves significantly.
Video : Principles of Intersection Safety
Final Thoughts: Are Roundabouts the Future of Road Design?
Roundabouts are more than just a traffic trend—they are a safer, smarter, and greener solution for modern transportation. With their ability to reduce crashes, improve traffic flow, and lower emissions, they are quickly becoming a preferred alternative to traditional intersections.
🚗 Safer roads, fewer accidents
🚗 Smoother traffic, less congestion
🚗 Lower fuel costs, reduced pollution
As more states adopt roundabouts in urban and suburban planning, they will likely become a permanent feature of America’s roadways.
So next time you approach a roundabout, embrace the change—it’s making our roads safer and more efficient for everyone!
THE LOVE STORY OF MARLO THOMAS AND PHIL DONAHUE.
Phil Donahue and Marlo Thomas wrote a book about marriage. It’s called “What Makes a Marriage Last: 40 Celebrated Couples Share with Us the Secrets.” In the book, they talk about their own marriage and share secrets from other couples.
Even though Marlo has been married to Phil for more than 40 years, she admits that when she was younger, she didn’t really want to get married.
In the book, Marlo Thomas talks about how she used to think marriage was like a vacuum cleaner that sucks out all your energy and ambition. She felt like living with a jailer you had to please.
But everything changed when she met Phil Donahue. They found each other after Phil’s first marriage ended, and now they have a strong bond that has lasted their whole lives.
Phil Donahue became famous with his TV show, “The Phil Donahue Show,” which later became just “Donahue.” It ran for 29 years and was the first show to let the audience join in. Marlo Thomas was a guest on his show, and meeting her changed Phil’s life.
The couple first met in Chicago in 1977. Phil Donahue already had four boys with him, and his fifth child, a daughter, lived with his ex-wife and her mother in another place.
Marlo and Phil dated for three years before getting married in 1980 in a small ceremony with 35 people.
Marlo’s friends and family were surprised by her decision to get married, given her past views on marriage. The book tells a funny story about friends at Marlo’s bridal shower putting up quotes from her that showed her previous thoughts about marriage.
According to the book, Marlo’s mom was really surprised at their wedding and kept asking Phil, “How did you get her to do this?” Even strangers, like a woman on their honeymoon plane to Greece, were shocked and disappointed that Marlo, who was known for being independent, decided to settle down.
In the book, Marlo admits that this made her doubt her choice. She wondered if she was being hypocritical since she had criticized marriage for so long. She worried that she let down fans who saw her as a symbol of independence.
Despite the challenges, Phil and Marlo make their marriage work. They talk about the ups and downs in the book, saying that those tough times helped strengthen their bond.
In the early days of their marriage, they spent time apart because Phil was taping his show in Chicago, and Marlo was traveling for her acting career. Even though they weren’t always living together, Marlo’s aunt helped her see that marriage can mean different things to different people.
Despite the distance, Marlo and Phil made their marriage successful. And one important thing to note is that Marlo not only gained a husband but also gained children when she got married.
In a 2012 interview with AARP, Marlo Thomas talked about helping to raise Phil’s children. She knew they already had a traditional mother, so she didn’t try to take on that role. Instead, she became more like a friend to Phil’s children, just like her own mother was to her.
Marlo says that her relationship with Phil’s children is even stronger now than when she first married Phil. In the book, Phil emphasizes that Marlo spent a lot of time talking to and trying to understand his sons.
Phil and Marlo think that the key to their long marriage is the trust they have in each other. Marlo says, “You build trust when you realize that this person always has your back.”
Even though they’ve been married for over 40 years, they believe there are still more memories to create together.
Phil says that for a marriage to last, both people have to really want it. Marlo agrees and says that looking back, she wouldn’t have it any other way than being married to Phil. She points out that he has supported her in every possible way.
Marriage is a wonderful connection, especially when two people fully commit to it. This couple is truly inspiring and sets a great example for all of us. We should all aim for a relationship as successful as theirs!
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