The annual Susan G. Komen Race for a Cure will take place this Sunday in downtown Denver and you can be sure it will cause some traffic trouble.
There will be 30,000 people taking part in the 5k run and walk.
Some of the biggest closures will be along Auraria Parkway, Federal Boulevard and Colfax Avenue.
Road closures will take place from 4:00 a.m. to approximately about 11:00 a.m.
Check out the map below to see which areas you should avoid:
The roads should be back open by about noon.