A multi-lane road is 10% less efficient than a single-lane road

In a multi-lane highway, when different lanes are moving at different speeds, drivers are more likely to change lanes.

Lane changing causes drivers to be more cautious.

Greater caution results in lengthening the distance between themselves and other cars.

This causes more lane changing (since there’s more space between cars)

Here is a picture that shows how one thing leads to the next. Note the positive feedback loop, which results in lots of lane changing and increasing distance between cars:

Positive feedback increased distance between cars

Each lane on the highway ends up carrying 10% fewer vehicles than if it were a single-lane road.

— Extracted from The Wisdom of Crowds by James Suroweicki

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: