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DENVER — It’s been a traffic mess for months, and starting Friday, congestion along I-25 and Sixth Avenue will get worse for about 10 days.

Workers will be reconfiguring the interchange during that time.

Friday night, Federal Boulevard will be reduced to one lane each direction and the westbound Sixth Avenue off-ramp to Federal will close for the next 10 days.

Then next weekend, the entire I-25, Sixth and Federal interchange will close for 31 hours.

“When we get these opportunities to have these full closures for an extended period of time we try to make as big an impact as we can,” project engineer Matthew Pacheco said.

The project is replacing a 60-year-old bridge on Federal with a new, wider, higher bridge over Sixth Avenue.

Workers are asking drivers to be extra cautious through the construction zones and to pay extra attention to detour and closure signs.

The ideal thing to do would be to avoid driving in the area altogether if possible.