Abstract
To improve the safety of superhighways, a virtual track system for superhighways based on intelligent road buttons is studied by means of a structural analysis and mathematical model. The system consists of a road subsystem, onboard subsystem and service center subsystem. When a vehicle equipped with an onboard subsystem nears the road buttons, they activate the virtual track system, and the reader reads location coordinates and road alignment information at that point from the label buttons. At the same time, the data processing module begins to function. First, the module reads the linear parameters and processes them to obtain the angle between the road tangent and vehicle body. Then, the module reads the angle of the front wheels, the vehicle speed and the distance between the adjacent two label buttons. Finally, the module obtains the rotational speed of the steering wheel while the vehicle is driving between two label buttons by using the computational model and sends the control parameters to the steering motor. The research results show that when the design speed of the superhighway is 140 km/h, 160 km/h and 180 km/h and the distances between the road buttons are less than 1.33 m, 1.50 m and 1.69 m, respectively, the distance between the centerline of the road and the vehicle can be restricted to less than 50 cm. Therefore, the virtual track system based on intelligent road buttons can restrict vehicles to travel in the virtual track and ensure the safety of superhighways.
Highlights
In more than 10 countries in Europe, including France and the Netherlands, the maximum speed limit on highways is 130 km/h [1]; in Texas, USA, it is 137 km/h (85 mile/h) [2]; in Italy, Saudi Arabia, Poland, it is 140 km/h [3]; and in Germany, there is no speed limit on some highways [4]
The results show that improving the design speed of the superhighway cannot improve its traffic capacity; a special highway for automatic driving vehicles can improve the design speed and improve the traffic capacity [10]
The Lane Keeping System (LKS), Lane Keeping Assist (LKA) and Lane Departure Warning System (LDWS) are mainly used for ordinary roads, whereas the Superhighway Virtual Track System (SVTS) is mainly used for superhighways with design speeds exceeding 120 km/h
Summary
In more than 10 countries in Europe, including France and the Netherlands, the maximum speed limit on highways is 130 km/h [1]; in Texas, USA, it is 137 km/h (85 mile/h) [2]; in Italy, Saudi Arabia, Poland, it is 140 km/h [3]; and in Germany, there is no speed limit on some highways [4]. More than 60 years have passed, the technologies of highway construction and automobile performance have been considerably improved in China, and it is possible to construct superhighways with design speeds exceeding 120 km/h. The LKS, LKA and LDWS are mainly used for ordinary roads, whereas the SVTS is mainly used for superhighways with design speeds exceeding 120 km/h. The virtual rail train is mainly used for low-speed urban public transportation, while our virtual rail system based on intelligent road buttons is mainly used for highways. The Intelligent Network and Transportation Joint Research Institute of the Southeast University-University of Wisconsin is engaged in research on autonomous driving lanes based on vehicle-road collaboration technology and has applied for a number of patents in the United States and China, providing technical support for the development of superhighways. The structure and installation of the onboard subsystem are shown in Figure 1 and Figure 2
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