traffic congestion | KUOW News and Information

traffic congestion

See that car in the middle lane zipping to the front of the line? You hate that driver, but they're actually doing the right thing, known as the zipper merge.
WSDOT

Three years ago, we ran a story about a little-known traffic tip known as the "zipper merge." 

In short: Drivers should use all lanes leading up to a merge point, rather than clog up one lane. Arrived at the front of the line, drivers in all lanes take turns merging. This is not cheating! (See image above for why the seemingly polite way gunks up traffic.) 

Drivers wait to cross Mercer Street
KUOW Photo/Joshua McNichols

Traffic engineers have a nickname for the years 2019 to 2021, when a slew of new megaprojects will get underway in downtown Seattle around the same time. They call it “The Period of Maximum Constraint.” Translated into plainspeak, it means during those three years, we’ll be up the creek in a leaky canoe without a paddle.