What do the colours mean on the timing sheets?

The sports broadcaster uses colours to show the driver’s performance, measured against his previous time and the best time for the session. The circuitA circuit is a racetrack for car racing. There's more... is divided into three sectors and each sectorF1 is a data-hungry sport with numerous sensors monitoring car performance, driver movements and position on the track. In addition,... There's more... will display its own split time. 

The colours and their meaning are as follows

• White – the current official recorded time. 
• Yellow – signifies the driverOK, 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, but with no improvement. 
• Green – signifies the driver has completed the sector and bettered his previous time for that sector. 
• Purple – signifies the driver has completed the sector and has done the best time of the session. 

The timing sheets will then flash up the driver’s lap time in the overall colour achieved.