Exhaust and noise emissions have become an important issue due to the strong increase in traffic. This has triggered tightened statutory regulations and ground-breaking technical developments for advancing efforts for greater reductions with the challenges centering around 

• vibration control (noise reduction)
  
• scaling back pollution with high-temperature materials, catalyst and particle filter technology or alternative drives (such as hydrogen, fuel cell and hybrid drives)
  
• driving down fuel consumption with lightweight engineering, boosting drive performance (aviation turbine and engines) and active shapecontrol (for airplane wings) 

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