What causes urban congestion culprit in the end is?

Accident? Traffic lights? Or because the road?

In fact, the murderer urban congestion caused by drivers who are unruly, uncivilized driving cause! Or sudden deceleration of the preceding vehicle changing lanes around the vehicle can play a chain reaction, so congestion appeared!

1, when the green light, the car in front slow start.

Trucks started too slow, because look at mobile phones, micro letters, chat, trance and so on. Anyway, the car is not by bit, do not know the car before the light changed.

2, lane change random random stopper and a plurality of lead wires lanes slowed, to form a vehicle rear chain reaction deceleration, braking. Sometimes a little faster because the lane next to some, it may be from two parking spaces, some owners began to change lanes can really do it faster? not necessarily!

3, the front brake reason

Traffic flow when the larger distance between vehicles will inevitably closer, but no reason to slow the vehicle in front, and a lot of impact to the rear of the vehicle after the brakes, these situations are at the phone, the phone does not recognize the road and the driver, is not necessarily so open that novice drivers.