Teoría atómica

The extension of the monitoring network should certainly be further elaborated, so that the whole network will exist out of double induction loops and the less reliable data from single loops are no longer necessary for the calculation of lost vehicle hours. In order to do so, the current algorithm for calculating VHL must be adapted to the use of these double loops, since the current algorithm can only calculate VHL based on single induction loops, which can make the estimates less accurate. By adjusting the algorithm,

the R1 around Antwerp can also be included again, allowing a more complete estimation of the lost vehicle hours for Flanders. Moreover, this network of double induction loops must be dense enough, making it a closed and redundant, and in this way also a more reliable, measurement system.

Along with the elaboration of the measurement system on the main road network, it is also very important to calculate the lost vehicle hours incurred on secondary roads. This will be far more complex than on the main road network, but since the estimated time losses incurred on the secondary roads are four times as big as the time losses on the main roads (Maerivoet & Yperman, 2008), this is a very important issue for further examination.

Once all this data can be collected, it must be examined which method is the best for actually calculating the lost vehicle hours in a reliable way.

6.2 Future Research

To further improve the calculation of the lost vehicle hours it may be interesting to examine some of the following issues:

The different methods to calculate the VHL have to be tested and evaluated in different traffic situations (free flow traffic, stop and go traffic jams, accidental traffic jams,…). This way the algorithm that works best in a specific situation can be selected. It has to be noted that the existing algorithm, which is being used at this moment, can still work properly after the adjustment to the new measurement systems of double loops. Moreover, other travel time algorithms, such as the trajectory method, the input-output method,… can be studied in more detail. New technologies that can be used to determine the lost vehicle hours, such as the use of ALPR, Bluetooth, signature detection with double induction loops, FCD (GPS),… are also worth exploring and the future may lie in the combinations of some of these systems. Finally, the interpolation techniques for unavailable data are very important for the calculation of the lost vehicle hours because of their influence on the accuracy of the figures and can also be studied in more detail. Besides, in this report data from different, sometimes foreign, studies are frequently used. Interesting further research could therefore include a deeper examination of the different calculations and figures of each study, certainly if multiple sources provide different results for the same parameter. In this way, the accuracy, reliability and representativeness of the used figures can be examined.

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