Illinois Driving Permit Practice Test

The sign that indicates that passing is prohibited is the "No passing zone" sign. This sign is specifically designed to inform drivers that they are in an area where overtaking or passing another vehicle is not allowed. Typically located in sections of the road where visibility is limited or where it would be unsafe to pass, this sign is meant to enhance safety for all road users, including vehicles, cyclists, and pedestrians. In contrast, the other signs—such as those indicating farm machinery, reduction of lanes, or road narrows—focus on different warnings or conditions without explicitly prohibiting passing. For instance, the farm machinery sign alerts drivers to watch for slow-moving agricultural vehicles, while the reduction of lanes and road narrows signs inform drivers of changes in the road layout, which may require caution but do not necessarily indicate passing restrictions.