The white lines on a running track are the output of a survey, not a painting job. Each lane's distance depends on its radius, and the radius depends on where the lines are placed.
Why the geometry is unforgiving
A standard track is two straights joined by two semicircles, and every lane outside the first runs a longer curve simply because its radius is larger.
That difference is why staggered starts exist, and the stagger is calculated from the lane width and the assumed running line inside each lane.
An error in lane width therefore propagates outward, making every stagger beyond it slightly wrong even if the first lane is perfect.
Measurement runs from a defined line
Lane one's distance is measured a set distance out from the inner border rather than along the line itself, because runners do not hug the raised edge.
Outer lanes are measured a fixed distance from their inner line, and those conventions are what make the published distances meaningful.
Surveyors establish a center point and radius, then set out the curve with instruments before any marking machine is brought onto the surface.
Marking is done to the survey
Lines are laid out using established points and chalk strings, and the paint itself is a specialist coating compatible with the synthetic surface.
Line width is part of the specification, and lines belong to specific lanes, which is why a lane's usable width is measured to a consistent edge.
Marking machines produce clean edges but cannot correct a mislaid string, so the survey is checked before spraying rather than after.
The events on the infield complicate it
Steeplechase water jumps, jump runways, throwing circles and sector lines all have their own geometry that has to coexist with the running lanes.
Runways must be straight and level within tight limits, and throwing sectors are set by angle from a circle center, which is another survey task entirely.
Every added event line increases the visual clutter, which is why tracks use color coding rather than adding more white paint.
Recertification catches drift
Surfaces move. Bases settle, curbing shifts and repairs change edges, so a track measured accurately when built can drift out of tolerance over years.
Facilities seeking record-eligible status are re-surveyed, and the measurement is of the track as it exists rather than as it was designed.
That is the practical reason a performance can stand at one venue and not at another, with nothing about the athlete or the timing being different.

