Wow, works like magic ! Actually Swedish drivers are somewhat more obedient and indeed traffic problems are due to road hazards are on average less severe.

For example when Swedes sees a lower speed sign or even just a warning before a road block they will slow and stay in one long lane, while in the mid eastern country I live in until recently everyone just speeds up trying to be first to pass the blocking. The results ? smoother flow and shorter queues, guess where ?