Abstract
Due to their simplicity and operating mode, magnetic loops are one of the most used traffic sensors in Intelligent Transportation Systems (ITS). However, at this moment, their potential is not being fully exploited, as neither the speed nor the length of the vehicles can be surely ascertained with the use of a single magnetic loop. In this way, nowadays the vast majority of them are only being used to measure traffic flow and count vehicles on urban and interurban roads. This is the reason why we presented in a previous paper the double magnetic loop, capable of improving the features and functionalities of the conventional single loop without increasing the cost or introducing additional complexity. In that paper, it was introduced their design and peculiarities, how to calculate their magnetic field and three different methods to calculate their inductance. Therefore, with the purpose of improving the existing infrastructure and providing it with greater potential and reliability, this paper will focus on justifying and demonstrating the advantages offered by these double loops versus the conventional ones. This will involve analyzing the magnetic profiles generated by the passage of vehicles over double loops and comparing them with those already known. Moreover, it will be shown how the vehicle speed, the traffic direction and many other data can be obtained more easily and with less margin of error by using these new inductance signatures.
Highlights
When trying to respond to basic questions such as the number and type of vehicles that circulate on the road [1,2,3,4,5], the speed at which they circulate [6,7,8,9,10] or the direction in which they do it [11], there is a large number of interesting studies related to different Intelligent Transportation Systems (ITS) technologies that can be consulted
For this reason we presented in a previous paper a theoretical study to explain the design and peculiarities of the innovative double loops, how to calculate their magnetic field and three different methods to calculate their inductance [29]
After the presentation of the double loop, where geometry, construction, operating mode and three possible ways to calculate its inductance was explained, this paper aimed to present the Double loop advantages magnetic profiles generated by these loops and to demonstrate that the typical traffic parameters, previously calculated with two single loops per lane, can be obtained more with this new loop model
Summary
When trying to respond to basic questions such as the number and type of vehicles that circulate on the road [1,2,3,4,5], the speed at which they circulate [6,7,8,9,10] or the direction in which they do it [11], there is a large number of interesting studies related to different ITS technologies that can be consulted. In this way, the traffic regulator can calculate the speed and length of the vehicle and classify it by an estimate of length and not by its magnetic profile. This self-induction will be a constant parameter for each vehicle while the mutual induction will be a parameter that will depend on the relative position between this and the loop From this expression it becomes clear that it is impossible to determine the type of vehicle and its speed in an exact way with a single loop, since there is two unknown data (Mloop/vehicle and Lvehicle) with the variation of a single parameter (Δf), which is obtained from the magnetic profile left by the vehicle. The expression of the flux through the equivalent loop of the vehicle at each instant would be:
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