Question A driver must slow down in a school zone: Answers On school days between 7 a.m. and 4 p.m., when children are present, and where signs are posted. On weekends. Only during recess. Explanation Drivers must reduce their speed to 20 mph in a school zone on school days between 7 a.m. and 4 p.m., when children are present, and where signs are posted. Take a FREE Practice Test Now This questions appears in the following tests: Illinois Practice Test