City's with a similar population, and population density, to Doha don't have the same sort of traffic problems because people in those city's are content to take trains and buses to work. Until a proper public transport system is constructed, and until people don't feel like 'only poor Asians take public transport' the traffic problem will remain. In other parts of the world it's completely normal for your kids to take the train to school, for men and women to take the train to work and for people to walk to the local shop to buy their groceries. But here in Doha everything gets in their car to do everything.