

You need to distinguish between driving slow on general and suddenly changing speed. Driving slow, and keeping your distance will reduce the chance of (abrupt) speed change, so it will reduce the chance for congestion.
Also, the more spread the cars are (inside the city) the less severe the congestion is.
You need to distinguish between driving slow on general and suddenly changing speed. Driving slow, and keeping your distance will reduce the chance of (abrupt) speed change, so it will reduce the chance for congestion.
Also, the more spread the cars are (inside the city) the less severe the congestion is.