Traffic Density Correction for Congestion Suppression
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Solution Overview
Problem
Existing traffic management systems are ineffective in preventing congestion as they rely on vehicles receiving and following traffic information, and do not account for vehicles without receiving equipment or drivers who ignore instructions, leading to biased traffic density and incomplete congestion suppression.
Innovation Solution
A traffic management system that collects vehicle information from sensors and calculates actual traffic density by combining vehicle count with section length, compares it to a threshold to detect congestion, and transmits lane-changing instructions to vehicles, both equipped for automatic driving and manual driving, using cloud servers and roadside communication systems to distribute traffic evenly across lanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traffic information is provided to vehicles to suppress congestion, then congestion suppression is improved, but the system is ineffective for vehicles without receiving equipment or drivers who ignore instructions, leading to biased traffic density
Solution Approach 1:
The patent introduces roadside devices as intermediaries between the traffic control device and vehicles. These roadside devices receive lane changing instruction signals from the traffic control device and transmit them to vehicles, ensuring that all vehicles regardless of their receiving equipment capabilities can receive traffic management instructions. This intermediary layer resolves the contradiction by providing universal coverage while maintaining system reliability.
2Device complexity
If traffic density is calculated based on vehicle count and section length, then traffic density measurement is simplified, but the calculation does not account for traffic volume variations, leading to inaccurate congestion detection
Solution Approach 1:
The patent implements a feedback mechanism where the traffic control device continuously monitors actual traffic conditions and compares them with calculated traffic density values. When discrepancies are detected (indicating inaccurate congestion detection), the system adjusts the traffic density calculation by incorporating traffic volume data from probe information. This feedback loop resolves the contradiction by maintaining calculation simplicity while improving measurement precision through iterative refinement.
3Productivity
If lane changing instruction signals are transmitted to vehicles, then traffic distribution across lanes is improved, but the system cannot ensure compliance from manual driving vehicles or those without receiving equipment
Solution Approach 1:
The patent employs preliminary action by providing lane changing instruction signals to vehicles before they actually need to change lanes. The traffic control device calculates traffic density and determines optimal lane assignments in advance, then transmits instructions to vehicles ahead of time. This allows drivers of manual vehicles to prepare and comply with instructions, while also giving automated vehicles sufficient lead time to execute lane changes safely, thereby improving both traffic flow efficiency and instruction compliance rate.
Data Source
AI summary
A traffic management system includes a traffic information collector, a traffic information acquirer, and a traffic manager. The traffic information collector collects the number of vehicles passing through a predetermined section, the traffic information acquirer acquires, as traffic information, the number of vehicles and vehicle information of vehicles passing through a vehicle sensor provided behind the predetermined section, and the traffic manager determines a traffic density based on the number of vehicles and a section length, calculates a traffic volume from the number of vehicles passing by the vehicle sensor, corrects the traffic density with the traffic volume to determine an actual traffic density, compare the actual traffic density to a determination threshold value for determining a congestion indication to check a congestion indication, and transmit a lane changing instruction signal to the vehicle traveling behind the vehicle sensor when the congestion indication is detected.