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NDOT announces construction on state’s first diverging diamond interchange 


RENO, NEV. — Construction is underway on Nevada’s first Diverging Diamond Interchange (DDI) at I-580 and Moana Lane. The Nevada Department of Transportation’s (NDOT) $6.9 million Moana Lane DDI Project is the first in the state and is also the first transportation project in northern Nevada to use the Construction Manager at Risk (CMAR) method of procurement and install “green” bike lanes.

The project is on a fast-track construction schedule and includes two phases. Phase one includes reconstructing the I-580 southbound Moana Lane off-ramp and prep work to reconstruct the northbound on and off-ramps. Phase two includes reconstruction of the I-580 Moana Lane northbound on and off ramps and the southbound on ramp, and Moana Lane from just west of the southbound off-ramp to just east of the northbound off-ramp.

Diverging diamond interchanges are often used at intersections located beneath or above freeway bridges. Traffic briefly crosses over to the left (opposite) side of the roadway, safely guided by traffic signals, physical barriers, and pavement markings at each crossover. Vehicles turn left onto freeway on-ramps without stopping and without conflicting with through traffic. Green bike lanes provide a clearly defined and dedicated lane for bicyclists by painting a green box in the lane.

Granite Construction is the contractor on the project. The project includes two phases with estimated completion on November 21, 2012. Project improvements include: drive time savings, efficiency, congestion relief, safety, cost and time savings, reduction in head-on crashes and reduction in maintenance. This is also the first project in northern Nevada to include “green” bike lanes resulting in safe bicyclist access.
 


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