Drivers operating vehicles on a divided highway must _________, unless directed to do otherwise by a sign, traffic control device, or police officer.

Driving on a divided highway typically requires vehicles to stay to the right of the median. This rule helps ensure a clear and safe passage of traffic by maintaining designated lanes for vehicles traveling in opposite directions. The median serves as a physical barrier that separates opposing flows of traffic, and staying to the right minimizes the risk of head-on collisions.

Moreover, this general rule allows for better organization and uniformity on the roadway, which is essential for driver safety. If a sign, traffic control device, or police officer indicates otherwise, then drivers may have a reason to deviate from this rule, but in absence of such directives, sticking to the right of the median is the standard practice. This ensures consistency for all drivers on the road.