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  [On the left, traffic jam animation: tight-packed cars creep along a two-lane highway, and finally take turns moving forward into a single lane where the second lane is blocked.] [On the right: similar animation. Two lanes of widely-spaced cars merge at high speed. Two lanes of traffic merge into one like meshing gear teeth. They form one line which then races past the blocked lane without slowing.]

MERGING-LANE TRAFFIC JAMS,

A SIMPLE CURE

(GIF Animations are loading)
ON THE LEFT: NORMAL DRIVERS WHO PACK THEMSELVES TIGHTLY TOGETHER WHENEVER THE TRAFFIC COMES TO A STOP. NOBODY CAN MERGE EXCEPT AT THE END OF THE JAM. NOTE THEIR LOW SPEED.
ON THE RIGHT: DRIVERS WITH UNUSUAL BEHAVIOR: THEY ENCOURAGE OTHERS TO MERGE AHEAD OF THEM, AND THEY TEND TO MAINTAIN LARGE SPACES AHEAD, EVEN IF TRAFFIC SLOWS TO A CRAWL. MERGING IS EASY. SEE HOW MUCH FASTER THEY GO?

Traffic jams on highways are often triggered where two lanes must merge into one. Lanes of cars cannot merge if there are no large gaps between cars. Therefore, drivers who create large gaps between cars will ease this type of traffic jam.
SIMPLE, EH?



To ease this type of jam:

  • Maintain a large space ahead of your car.
  • Never "punish" late-merging drivers by closing your gap. It's illegal, and for good reason.
  • Encourage one, two even three cars to merge ahead of you.
  • As you approach the final merge point, open your space wider and wider.
  • If traffic slows to a complete stop, KEEP TWO CAR-LENGTHS OF SPACE OPEN AHEAD OF YOU.
  • Fed Hwy Admin says: merge at the last minute. Early merging is the cause of jams.
  • MnDOT: Do The Zipper Merge
  • MnDOT vid on proper merging
  • Other suggestions
Amazingly enough, it is not necessary that EVERYONE do this. If only a few drivers will maintain extra-large gaps during heavy traffic, then merging traffic is not forbidden, and the situation in the left-hand diagram can be prevented.

The "zipper flow" is counterintuitive. It's created by proper late-merging at the last minute. It's destroyed by early merging. For this reason, the Fed Highway Admin has specific recommendations for proper driver behavior. They and the various state highway groups also have found the best signs to smooth the flow: "STAY IN LANE UNTIL MERGE POINT." Then at the last minute, another sign: "MERGE HERE, TAKE TURNS." Early merging ruins everything. Any drivers who encourage early merging, but who tailgate to punish late merging, they've fallen for faulty reasoning ...the situation is counterintuitive. The ideal behavior is the exact opposite: keep everyone in their lanes, no early merging allowed. Then take turns merging *only* at the last minute. Anything else is a recipe for hot-headed tailgaters and jam-triggers.

------

Yes you're right, you cannot eliminate every problem by simply making a big gap in front of your car. When there are too many cars on the road, traffic slows down. But if we use these special driving habits, the smaller jams can be erased, and stop-and-go traffic can be smoothed out. Since many traffic jams are caused by merging lanes, many traffic jams can be improved by the actions of just one driver.
NEXT, PAGE 4: FREQUENTLY-ASKED QUESTIONS

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