Further Considerations
- No standards currently exist for this design and the design is extremely dependent on site-specific conditions.
- There is no crash history available in the North America region, as no DDIs existed in North America until June 21, 2009, when North America's first DDI opened to traffic in Springfield, Missouri.
- Additional signage, lighting, and pavement markings are needed beyond the levels for a standard diamond interchange.
- Local road should be a low speed facility, preferably under 45 mph (72 km/h) posted speed on the crossroad approach. However this may be mitigated by utilizing a higher design speed for the crossing movements.
Read more about this topic: Diverging Diamond Interchange