Drivers on Korean expressways sometimes assume they can offset earlier speeding in a section-control zone by stopping at a rest area and lowering their average speed. Police operating rules show why that does not necessarily work.
Section enforcement calculates three separate measurements: the vehicle's instantaneous speed at the starting camera, its instantaneous speed at the ending camera and its average speed across the controlled distance. A long stop can reduce the average, but it cannot rewrite the speed already recorded at either endpoint.
Three measurements, not one average
The system does not simply add three penalties for the same passage. According to the police operating guidance cited in the report, the applicable violation is based on the most serious of the recorded measurements, so a driver can still receive a penalty even when the overall average falls below the limit.
That distinction matters on holiday routes where rest areas are crowded and drivers may encounter long section-control zones. The cameras are designed to discourage both sustained speeding through the segment and bursts of speeding immediately before or after a stop.
The simplest way to understand the rule is that a rest break affects only elapsed time. It does not erase an instantaneous speed reading already captured by a camera, which is why the idea of using a rest stop to 'beat' section enforcement is unreliable.