No passing zone signs are posted on which side of the roadway?

No passing zone signs are specifically posted on the left side of the roadway to ensure the visibility for drivers approaching the area. These signs indicate that it is unsafe to pass due to conditions such as curves, hills, or intersections where visibility is limited. By placing the sign on the left, it allows drivers in oncoming lanes to be alerted to the restrictions as they approach the area, promoting safer driving behavior.

When these signs are positioned on the left, it reinforces the idea that any passing maneuvers should be deferred until the driver is well clear of the no-passing zone. The strategic placement enhances overall road safety by clearly defining areas where overtaking other vehicles could lead to dangerous encounters. Additionally, this positioning aligns with traffic regulations and signage standards, maintaining consistency for drivers across different regions.