I think the busiest roads in Dubai are: Emirates Road, Sheikh Zayed Road, Khaleed Bin Al Waleed, Bank Street, Sheikh Mohd Bin Zayed Road.
Whenever I was driving to these roads, I felt as if its never ending traffic. Specially when you drive on these roads on peak time (i.e., Morning and evening), you will get stuck in the traffic. I wonder, even after so many public transport solutions we realize so much traffic on road what will happen in coming years. I am really looking forward for a solution for this congestion problem on Dubai Roads.