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Lacey diverging diamond interchange set to open – Washington’s first!

Overhead view of Marvin Road interchange with Tacoma to the left and Olympia to the right. Red lines show the overpass is closed for the weekend.
Credit: WSDOT

“Washington’s first diverging diamond interchange to open on Marvin Road and I-5 in Lacey”

Improving Marvin Road at I-5 in Lacey

The state’s first diverging diamond interchange is set to open in Lacey following an upcoming weekend closure of State Route 510/Marvin Road overpass above Interstate 5 next month.

The development is a major milestone for the Washington State Department of Transportation’s project that is intended to improve travel and safety in the fast-growing South Sound community.

Diverging diamond guides travelers through
Clearly marked signs, pavement markings and traffic signals intuitively guide people traveling through the upgraded interchange. Vehicles are briefly directed to the other side of the roadway where they cross back over or merge onto I-5.

A diverging diamond interchange, already in use in many other states, moves vehicles more efficiently than a traditional interchange. They also reduce the potential for collisions as the innovative design removes areas where vehicles merge, diverge or cross.

In order to transform the interchange, WSDOT’s contractor will close the Marvin Road overpass along with the adjacent I-5 off- and on-ramps during the last weekend of the month.

Closures details
9 p.m. Friday, July 31 – 5 a.m. Monday, August 3

  • Marvin Road overpass between Quinault Drive Northeast and Main Street Northeast.
  • Both Marvin Road on-ramps to southbound I-5 and northbound I-5.
  • Northbound and southbound I-5 exits to Marvin Road.

Posted by Steve on July 22, 2020 at 12:10 am | Permalink

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