The track is divided into three sectors, and each of those is broken down into mini sectors. The media will generally display and refer to Sectors 1, 2 & 3.
As the car completes a lap, its progress is reported against the sectors, and as each is completed, it will light up in yellow, green or purple.
A green sector
F1 is a data-hungry sport with numerous sensors monitoring car performance, driver movements and position on the track. In addition,... There's more... shows that the driver
OK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... has completed the sector and achieved a personal best, indicating a performance improvement.
