I-17 to Get 3rd Southbound Lane from Black Canyon City to Anthem

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i-17 two lanes at anthem way
I-17 narrows to two lanes here, seen looking north from the Anthem Way overpass. In&Out Staff Photo

Construction will start in 2020 on a third southbound lane on Interstate 17 between Black Canyon City and Anthem, ADOT said this week. It’s the first piece of a previously announced plan to create three lanes in both directions in the years 2021-22, plus build flex lanes northward to Sunset Point. The flex lanes would be open to one direction at a time depending on need.

The entire project is still in the study phase, and a specific start date has not been set, said ADOT spokesperson Doug Nintzel.

“We plan to start the work [on the initial widening] in 2020, with work on the flex lanes slated to start in 2021,” Nintzel told North Phoenix News. “That additional southbound capacity, as a start, will work best with the flex lanes when they open to traffic—since we can look ahead to times when (potentially) four southbound lanes will need to merge into three.”

Flex Lanes

The flex lanes, also called “reversible lanes,” would improve traffic flow in the crash-prone, 8-mile grade from Black Canyon City to Sunset Point. They would be used for the busiest direction of travel. For example, they could be used for northbound travel on a Friday as vacationers head to the mountains, then used for southbound travel on Sunday.

The extra lanes would be controlled at each end by a gate or similar mechanism, to prevent drivers from entering in the wrong direction. Similar systems are used in cities to create extra lanes in either direction of bridges.

“Those separate lanes would be operated with gate or barrier systems on either end to allow only one direction of traffic,” Nintzel has said previously.

Construction of the flex lanes is expected to take two years, ADOT said this week.

All the Way to Flagstaff?

In June 2017, the State Transportation Board approved a five-year plan that includes funding for design and construction of the project. North Phoenix News initially reported the project proposal last in February 2017.

Final designs and plans are expected to be completed in summer, 2019.

The agency’s longer-term goal is to widen I-17 to three lanes all the way to Flagstaff, Nintzel said early last year. That project, which is only a vision for now, would require separate approval and funding.

Crash Causes

ADOT officials have repeatedly stressed that crashes on I-17 are almost always the result of driver behavior, not the road itself.

“New lanes will play a role in improved safety, but driver behavior remains the key,” ADOT Director John Halikowski said this week. “The reality is that a reduction in speeding, sudden lane changes and impaired driving would reduce crashes, closures and frustrating traffic backups along this corridor.”

Forty percent of accidents on the crash-prone stretch of freeway near Black Canyon City are caused by drivers going too fast for the conditions, ADOT said last year. Statewide, speeding is the No. 1 cause of crashes, and 31 percent of motor vehicle deaths in 2016 involved speeding.

More about the project and public meetings related to it are here.


Help Save Our Community
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Robert Roy Britt
NoPho resident Robert Roy Britt has written for In&Out publications since its inception in 2005. Britt began his journalism career in New Jersey newspapers in the early 1990s. He later became a science writer and was editor-in-chief of the online media sites Space.com and Live Science. He has written four novels. Email the author.
Robert Roy Britt on Email

Robert Roy Britt

NoPho resident Robert Roy Britt has written for In&Out publications since its inception in 2005. Britt began his journalism career in New Jersey newspapers in the early 1990s. He later became a science writer and was editor-in-chief of the online media sites Space.com and Live Science. He has written four novels. Email the author.

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