Why has the westbound traffic at Rundberg and I-35 been 10x worse every morning this week?

I know there is some construction happening right under 35, but none of it is happening at seven in the morning. None of the lanes are blocked off and yet my 15 minute commute has taken 25 minutes for the last three mornings. It’s taken me 10 minutes to go the half mile from my house to I-35. Is this traffic that’s being diverted from something else that’s under construction? I need to figure out how to avoid this if it’s going to continue.