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The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions. Famous battle sites, man-made wonders, Mother Nature in all her splendor and World Heritage Sites are all listed in their itineraries. World renowned game parks where people can view Africa's Big 5 in their natural surroundings and natural splendors such as Vic Falls give tourists an all encompassing appreciation for this continent and its wonders.