-Give Way when someone try to enter from side road> THE PERSON ENTERING FROM THE SIDE ROAD MUST GIVE WAY TO THOSE ON THE MAIN ROAD.
-Give Way when someone crosses the road> DO NOT CROSS THE ROAD UNTIL IT IS CEAR - IN OTHER WORDS GIVE WAY TO THE ONCOMING TRAFFIC BEFORE CROSSING
-Give Way when someone tries to overtake
-Give Way when someone is reversing his car> DO NOT REVERSE UNLESS THE WAY IS CLEAR - IN OTHER WORDS GIVE WAY TO THE ONCOMING TRAFFIC

The reason it is set up this way is to maintain traffic flow. Traffic flow is not maintained in Doha because people are always trying to force their way into oncoming traffic instead of patiently awaiting their rightful turn.

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"A Wise Man knows what he does not know!"