THIS AMENDMENTS AIMS TO REDUCE THE VOLUME OF POLLUTION COMES OUT OF BUSES AND TRUCKS EXHAUSTS TO INCREASE MOTORS EFFICIENCY IN ORDER TO EXPAND THE PERIOD OF RE-ADJUSTING THE MOTORS .THIS WILL LEAD TO REDUCING MAINTENANCE COST .CANCELING THE UPPER AND OUTSIDE EXHAUSTS FOR THE BUSES AND TRUCKS WILL IMPROVE THE APPEARANCE, REDUCE THE COSTS, LEAD TO PREVENT OR LESSENS THE POLLUTION AND -KEEP ENVIRONMENT CLEAN
