Few rules while driving in Qatar.

1st Lane = Speed Limit+20 ( Slow down when you see radar)
2nd Lane = Speed Limit+ ( Slow down when you see radar)
3rd Lane = Speed Limit-10

Overtaking is allowed from both sides in some areas, especially when police is not around.
while near to Roundabout, decide on which side you have to go, and then select the proper lane.