Traffic surveillance method and vehicle flow control in a road network

A method for monitoring traffic in a road traffic system, in which a distinction is made between three types of traffic states, including free traffic flow, synchronized traffic flow and wide moving traffic jams, said method comprising:

• determining one of current traffic states and predicted traffic states for at least one point of the traffic system;
• and
• determining that a phase transition from free traffic flow to synchronized traffic flow occurs if the following conditions are fulfilled
• (i) average traffic velocity decreases,
• (ii) traffic flow exceeds a predefinable flow threshold value, and
• (iii) the absolute value of the quotient formed from the change in the average velocity divided by the change in the traffic flow exceeds a predefinable threshold value.

A method for controlling inflow in a road traffic system, with a distinction being made between three types of traffic states, including free traffic flow, synchronized traffic flow and wide moving traffic jams, said method comprising:

• monitoring traffic states of a traffic system section;
• and
• controlling vehicle inflow into the traffic system section as a function of the detected traffic states;
• wherein the monitoring of traffic states includes
• determining one of the current traffic states and predicted traffic states for at least one point of the traffic system;
• and
• determining that a phase transition from free traffic flow to synchronized traffic flow occurs at said at least one point if the following conditions are fulfilled
• (i) average traffic velocity decreases by more than a predefinable degree, and
• (ii) traffic flow exceeds than a predefinable flow threshold value;
• and
• wherein vehicle inflow at a respective inflow point is controlled as a function of the phase transitions, detected by the monitoring of traffic states, between free traffic flow and synchronized traffic flow.

The method for controlling inflow in a road traffic system, with a distinction being made between three types of traffic states, including free traffic flow, synchronized traffic flow and wide moving traffic jams, said method comprising:

• monitoring traffic states of a traffic system section, and
• controlling vehicle inflow into the traffic system section as a function of the detected traffic states;
• wherein the monitoring of traffic states includes
• determining one of current traffic states and predicted traffic states for at least one point of the traffic system;
• and
• determining that a phase transition from free traffic flow to synchronized traffic flow occurs if the following conditions are fulfilled
• (i) average traffic velocity decreases,
• (ii) traffic flow exceeds a predefinable flow threshold value, and
• (iii) the absolute value of the quotient formed from the change in the average velocity divided by the change in the traffic flow exceeds a predefinable threshold value.