Diverging Diamond Interchange at Macleod Trail and 162 Avenue S.E.

In 2017, Canada’s first Diverging Diamond Interchange (DDI) was completed at Macleod Trail and 162 Avenue S.E. Built in response to the massive growth in that area over the last 25 years, the interchange was designed to improve mobility safety for the people who drive, ride and walk.

In five years, The City of Calgary has seen significant improvements in safety:

  • 75 per cent reduction in injury collisions (20 to 5)
  • 38 per cent reduction in total collisions (186 to 115)
  • 62 per cent reduction of collision to cost to society

About 70,000 vehicles use Macleod Trail every day at this location and about 35,000 on 162 Avenue/Sun Valley Boulevard.

The City of Calgary continues to evaluate the DDI’s performance with other types of interchanges in Calgary. 

What’s a DDI?

A DDI is a unique and modern interchange design that helps reduce traffic congestion and improve safety for people who drive, cycle or walk.

It allows two directions of traffic to temporarily cross to the left side of the road. It moves high volumes of traffic through an intersection without increasing the number of lanes and traffic signals.

Left turn movements are safer and more efficient because they do not cross opposing traffic.

How to drive the DDI


Read the recent 2022 Safer Mobility Plan Annual Report for more on how The City of Calgary improved mobility safety in 2021, 2022 achievements, and what’s next for the rest of 2022/2023. 

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