A reminder that the North Main Street Bridge will be closed to traffic from 6:30 am to the end of the workday (4:00 pm, later if needed) from tomorrow through Thursday, May 1. Pedestrian traffic across the bridge on the east sidewalk will remain open, closing briefly when necessary for safety reasons.

Calvin: How do they know the load limit on bridges, Dad? Dad: They drive bigger and bigger trucks over the bridge until it breaks. Then they weigh the last truck and rebuild the bridge. Calvin: Oh. I should’ve guessed. Mom: Dear, if you don’t know the answer, just tell him.
Calvin and Hobbes, “Bridge Capacity” by Bill Watterson for November 26, 1986