For sprinting events (bar the 4 × 400 m relay and the indoor 400 metres), each athlete must run the race within their allocated lane from start to finish. If an athlete leaves their lane or steps on the line demarking each lane the athlete will be disqualified. Lane rules also apply for initial periods of other track races, for example, the beginning of the 800 m. Similar rules apply for longer distance races when a large field of athletes is present and separate starting points are designated, with the field merging into one group shortly after the starting phase.