Unbelievable! It's almost as if subsidizing spam/noise transactions creates more of them. 
Indeed, building wider motorways doesn't necessarily solve traffic congestion. A bunch of other things sometimes do (raising gasoline/car taxes/prices, regulation, unemployment, crime, alternative transport, virtual working, better city layout, emigration...).
Toll could remove congestion on the smallest road. But it does not solve the capacity problem directly, only as a price signal to entrepreneurs to build higher capacity roads.
There is a reason that metropols have multiplie high capacity multiple lane roads going in and out. They need the capacity. The towns could not have grown to metropols without them.