The ways to reduce congesstion on roads are to be done in a massive & dynamic way. The present roads are not designed to carry heavy traffic situation. We have to study the overall situation in Qatar, and they implement new system of roads and traffic lights to move in a synchronized way.
I can suggest some good ways to reorgnaise Traffic :

1. Design the Specific Route System for each type of Travel and create a Parallel way also to handle emergency.
Eg. Doha Sea Port to Industrial Area - Make a Truck Road connection Industial Area Street 37 or 50 to Corciche Road thru Wakra & connect to the New Road, which can have Truck Traffic 24/7.
Also connect Vegetable/Fish market road to Truck Road.

2. Ramada Signal should have an underpass road similar like in Dubai Clock Tower,near Maktoum bridge to handle all time vechicle movements.

3. Make exit road system to Parallel roads incase of accidents or route change. Use underpasses the best ways as done in Dubai - Al Ain Road.

3. Build Fly overs in busy junctions & Cross Roads. Build a Flyover in Al Watan R/a., Parachute Signal, Crazy Signal, Al Waab Signal, Qtel Signal Jaidah Fly over to redesign to move traffic freely from all directions.

2. Build Parking centres and Pedestrial Underpasses in all the busy roads, instead of big high rise buildings & shopping malls. Shopping Malls should be Decentralised from City like in Villageo.