2/7/2013
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A question that is often asked is, “Why is the environment a part of Connected Vehicle Research?”
Transportation has a significant impact on the environment. Per the pie chart on the left, transportation overall accounts for about 28% of emissions.  Surface transportation, shown in the pie chart on the right, is a very significant proportion of those emissions. Light duty vehicles (58%), freight trucks (19%), motorcycles (0.1%), and buses (0.6%) sum to about 78% of all transport emissions.
Given these numbers, there would seem to be a significant window of opportunity here for ITS in general (and connected vehicle technologies specifically) to address environmental issues.  The ITS JPO’s AERIS program intends to investigate if connected vehicle technologies and strategies could have a significant impact on reducing the negative effect of transportation on the environment.
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ACC works like conventional cruise control, allowing the driver of a vehicle to set the desired speed, but it also automatically adjusts the vehicle speed to match the preceding vehicle to maintain a predefined following distance. ACC systems are typically radar-based systems installed in vehicles that can monitor the vehicle in front and adjust the speed of the vehicle to keep it at a preset distance behind the lead vehicle, even in most fog and rain conditions. These systems can determine how fast the vehicle is approaching the vehicle ahead. For example, when approaching a lead vehicle at a high rate of speed, the system will activate sooner than when approaching slower.
These systems enable the drivers to set a
desired cruising speed as well as a desired following gap with respect to a lead vehicle. If no lead vehicle is present, then the system will regulate the vehicle speed, as any conventional cruise control does, but once a lead vehicle is detected, the system will adjust the vehicle’s speed
to maintain the gap set by the driver, with no intervention needed from the driver.
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