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Posts Tagged ‘Intersections’

Europe has predominantly roundabouts, while North America sees mostly 4-Way Stops at intersections. But the question is which is more efficient, and which is safer.

MythBusters tackled this hot issue by measuring throughput using both methods. You can see the results in the video below. But before you do….

Roundabout

Roundabout

For those who are not used to riding with roundabouts, the scope is that you have two types of roundabouts; one where priority is given to vehicles on the roundabout, the other is priority is given to vehicles coming onto the roundabout. The usage will depend on the traffic layout and road density. The most commonly used one, is for priority is given to vehicles on the roundabout.

4-Way-Stop

4-Way-Stop

The advantages of the 4-Way Stops are they require less money to make since roundabouts take up more space and use up more road materials. A 4-Way Stop is also built much quicker than a roundabout. Roundabouts can also be used for more than 2 roads, they can have as many as are required.

Paris Arc de Triomphe roundabout with 11 roads

Paris Arc de Triomphe roundabout with 12 roads

But as you will see from the video, the efficiency of a roundabout is a lot, and I mean A LOT, more efficient.

Ecology-wise, a roundabout makes vehicles use less gasoline. With a 4-Way Stop, even if you are the only vehicle, according to the law, you MUST come to a full stop. Then you start rolling again. Even with a motorcycle, that will use more petrol. With a roundabout, if there is no traffic on the roundabout itself, you do not need to stop, you just keep on rolling. So less petrol is used.

As a biker, I prefer roundabouts. They are a bit safer than 4-Way Stops since I am always afraid that some SUV is going to forget it was my turn to enter the intersection. I’m not talking about malicious intent, just a mis-communication. With roundabouts, there is no problem with mis-communication; if you are on the roundabout, you have priority. So it’s relatively safer. I say relatively, since on roundabouts with more than 1 lane, it is not unusual to see accidents with vehicles in the inner lane suddenly turning out of the roundabout. And that can cause crashes, as I have experienced firsthand.

But on a whole, roundabouts are the way forward. Traffic becomes more fluid, safer and more ecological. So what are we waiting for? However, sometimes planners go wild with roundabouts. Here is one you do not want to take with a motorcycle:

Multiple roundabouts inside one big roundabout (UK)

Multiple roundabouts inside one big roundabout (UK)

What do you think? Are you for the American system or the European?

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