PRE-DRIVE C2X Deliverable D0.3 Final report_20100929.pdf

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Final Report PRE-DRIVE C2X 29.9.2010 longer distances between the V2X-based vehicles result in a loss of several V2X messages. Higher penetration rates allow a better message transmission and, thus, V2X-based vehicles have more knowledge about the current local traffic situation. A further reason for the continuous grows of the benefit for increasing penetration rates is the higher capacity of the circumnavigation routes. In the urban scenario, mostly small side streets are used for circumnavigation. Figure 25: Travel time benefit depending on the V2X penetration rate (highway scenario) In Figure 26, the CO2 emissions depending on the V2X penetration rate are depicted. The fuel consumption in Figure 27 shows a similar trend. The illustrated CO2 emission and fuel consumption values are the average values of classic (blue line), V2X-based (yellow line), and all vehicles (red line) per evaluated travel route. In contrast to the urban scenario, the traffic information & recommended itinerary does not cause a reduction of CO2 emission and fuel consumption in the high way scenario. Instead, both values increase slightly while the V2X penetration rate increases. The reasons for that are the relatively long distances of the circumnavigation routes. Vehicles save time because they can drive fast using a circumnavigation but this effect results in higher emissions. Classic vehicle follow the same trend. Here, emissions also increase while the V2X penetration rate increases. This result seems to be surprising because classic vehicles do not try to circumnavigate the congestion near the road works. The emission growth for the classic vehicles is originated from the driver models used in the traffic simulators VISSIM and SUMO. Vehicles drive very smoothly and prospectively when a reduction of lanes occurs. They use the "zipper rule" very carefully, i.e. each vehicle in the through lane allows one vehicle from the truncated lane to merge in. This process is done in a way that no strong slowdowns and speedups are necessary. In reality, a merging would not work so fine. Slowdowns and speedups would result in higher emissions. The very smoothly driving in the simulation causes an increase of emissions of classic vehicles because a higher V2X penetration rate results in less vehicles trying to pass through the road works; thus, vehicles can pass the road works Deliverable D0.3 Version 1.0 39 Final Report
Final Report PRE-DRIVE C2X 29.9.2010 with higher speed. Very high penetration rates (more than 80%) result in an emission reduction. Here, the well-balanced traffic distribution between highway and circumnavigations involves a clear run and, thus, compensates the higher emission by higher speed. Figure 26: CO 2 Emissions depending on the V2X penetration rate (highway scenario) Figure 27: Fuel consumption depending on the V2X penetration rate (highway scenario) Conclusions The VSimRTI simulations to detect the influences of the Traffic Information & Recommended Itinerary on the travel time benefit and vehicle emissions show the following results: The higher the penetration rate of V2X-based vehicles is the lower the travel times of all vehicles are. That’s true for the urban scenario as well as the highway scenario. The vehicle emissions show different trends for the urban and the highway scenario. In the urban scenario, a higher penetration rate of V2X-base vehicles results in a reduction of emissions. In the highway scenario, the emissions increase slightly when the penetration rate of V2X-based vehicles increase. This increase is mainly caused by the longer circumnavigation routes. However, the used driver models in the traffic simulators VISSIM and SUMO result in vehicles driving very smoothly and prospectively when a reduction of lanes occurs. This behaviour Deliverable D0.3 Version 1.0 40 Final Report
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