When the number of cars on the road is greater than that, the flow becomes unstable and natural fluctuations in our driving style alone are enough to cause traffic.
The water, albeit in smaller volumes, continues to flow, forming unstable layers of snow, slush and ice (see 2:08 when Gadd sinks his hooks into a piece of snow that simply crumbles away).
Of course when the dollar is weak and unstable, a disharmony reveals itself among the productive that frequently retards what should be the peaceful flow of goods.
It seems like a bit of a risky venture when the company is already appearing a bit unstable to investors, but perhaps if numbers like these are correct, Zynga could use the extra cash flow that would accompany such an endeavor.