I-215 Redwood Road Diverging Diamond Interchange

North Salt Lake City’s busiest crossroads—Interstate 215 and Redwood Road (SR-68)—faced daily congestion. To relieve the pinch point, the Utah Department of Transportation (UDOT) converted the junction into a diverging diamond interchange (DDI) and widened Redwood Road across the existing two-lane bridge.

Project Goals

Traffic models showed that traditional widening would not meet future volume. A DDI offered shorter signal cycles, fewer conflict points, and smoother left turns. The upgrade also had to fit within the tight urban footprint while maintaining freeway operations during construction.

CMT’s Services

CMT Technical Services supported the full life cycle of the improvement:

• Geotechnical exploration—borings, lab classification, and settlement analysis
• Environmental assessments to protect Jordan River wetlands
• Civil and pavements engineering for approach lanes and tie-ins
• Surveying & right-of-way mapping for precise bridge-deck alignment
• Construction management with on-site inspectors tracking daily work progress
• Laboratory & field materials testing—concrete, asphalt, binders, and calibration services, verified in AASHTO-accredited labs CMT Technical Services

Our agile team coordinated with designers, contractors, and UDOT staff so that phased traffic shifts kept commuters moving.

Outcome & Benefits

The completed DDI has:

• Cut average peak-hour delays by more than 40 percent¹
• Added dedicated pedestrian and bike lanes, improving multimodal safety
• Extended pavement life with optimized asphalt mixes
• Prepared the corridor for projected 2045 traffic volumes without major future widening

(¹Preliminary post-construction counts provided by UDOT)

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