offside rule
A system that gives right-of-way at an intersection to traffic approaching from the side on which one is not driving.
offside rule: priority system for cross-traffic at intersections
The offside rule is a right-of-way convention used at unmarked or uncontrolled intersections, primarily in countries that drive on the left. When two vehicles approach an intersection simultaneously from different directions, the vehicle approaching from the offside (the far side of the road relative to the driver) has priority and proceeds first. The driver on the nearside must yield. This rule exists to resolve conflicts when traffic signals, stop signs, or other control devices are absent or inoperative.
The logic behind the rule rests on visibility and driver positioning. A driver approaching from the nearside can see an oncoming vehicle more easily through the side windows and mirrors, whereas a driver from the offside has a partially obstructed view. By giving way to the offside vehicle, the nearside driver makes the safer choice: the other driver cannot see as well, so ceding priority reduces collision risk. The rule assumes both drivers understand and follow it consciously.
Application and Regional Variation
The offside rule applies mainly in left-hand traffic countries: the United Kingdom, Australia, India, Japan, and several others. In these jurisdictions, the offside is the right side of the road. Right-hand traffic countries (most of Europe and North America) do not use this rule; instead, they typically apply a general principle that the vehicle on the right has priority. The offside rule is less common in modern practice because most intersections are now controlled by signals, roundabouts, or explicit stop and yield signs, which eliminate ambiguity and render informal conventions unnecessary.
Professional drivers and transport operators must know the rule because it applies on rural roads, minor intersections, and in situations where control devices have failed. Insurance claims and fault determination can hinge on whether a driver correctly applied the offside rule. However, the rule should never replace caution: a driver with priority still has a duty to avoid a collision if the other driver does not yield. Defensive driving practice recommends assuming the other driver may not know or follow the rule.