How are traffic jams formed?

I came across a very interesting site where you can follow the simulation of road traffic. In our review, there are several possible situations: a roundabout, an entrance to the motorway, a blocked lane, a lift, a traffic light, a lane change. In all cases, use a two-lane road. It is also worth noting that for greater likelihood two types of vehicles are used - a car and a truck, which have different properties. For example, the dynamics of acceleration.

Of course, everything would not be so interesting if it were impossible to change the number of cars, temporary settings or speed limit. All this is possible, and even more!

So, we generate our own autotraffic and watch what happens: www.traffic-simulation.de
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PS This is my first habratopic, do not judge strictly. :-)