traffic noise


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traffic noise

  1. 1. by SUNIL GOND (
  2. 2. What is noise? Noise is excessive, displeasing human, animal or machine-created environmental sound that disrupts the activity or balance of human or animal life. 
  3. 3. The health effects of traffic noise · Annoyance.  · Sleep disturbance.  · Disturbed cognitive functioning (learning and understanding).  · Cardiovascular disease.  · Adverse effects on mental health. 
  4. 4. noise emmiting sources noise emmiting sources noise emmiting sources 70 60 50 40 30 20 10 0 65 55 7 15 4 5
  5. 5. Characteristics of Vehicle Noise        Exterior road traffic noise Trucks are typically noisiest followed by buses and motorcycles while cars are the quietest. The contribution of cars to the overall traffic noise level is great (about 80% of the road traffic). For lower speeds, below 40-50 km/h, engine noise including exhaust and intake noise dominates for cars. For higher speeds, above 70 km/h, tyre-road noise dominates the car exterior noise generation. For heavier vehicles the engine noise is dominant under most conditions. Internal vehicle noise is caused by airborne and structure borne noise from the engine and tyre-road interaction noise.
  6. 6. air pumping and tyre vibration Aerodynamic noise vehicle noise and vibration
  7. 7. Noise measurement Brad and Kjaer 2260 Sound Analyser   This device is one of the most widely used for analysis of traffic noise emissions in busy streets and cities. It measures the noise in A decibels (db A). One db A roughly corresponds to inverse of 40 db (i.e. 1 kHz) ; which equals to the loudness curve of human ears.
  8. 8. Efficient traffic management in cities like New Delhi Restricting use of horns in sensitive spaces like schools, colleges, hospitals Reducing speed limits Reducing vehicle speed by 10 km/hr leads to an approximate decrease of 2-3 db of noise from it. Efficient management of traffic lights Prohibiting the entry of certain heavy vehicles like trucks in certain part of streets Proper land use planning and management
  9. 9. Construction measures      Tyre width, tyre hardness, groove depth and road surfaces are pivotal factors affecting tyre noise. an optimal combination of tyre and road surface is required. ‘Porous asphalt’ has a potential to reduce the vehicle noise by 5-6 db Poro-elastic pavement when combined with a porous structure with a soft aggregrate can reduce an unbelievable noise of 10-12 db for normal tyres and 1315 db for studded tyres STC (Sound Transmission Class) – it is an integer rating of how well a building partition attenuates an airborne sound. The better the STC of a material, the better sound insulation it provides.
  10. 10. Governmental measures   Strict rules and regulations have to be devised for vehicle-spare-part producing companies (for manufacturing of engines, tyres, etc.) to follow the CPCB noise limits or else their certification would not be easy. THE NOISE POLLUTION (REGULATION AND CONTROL) RULES, 2000 Luxury Limousine 77dB Small passenger car 79dB Miniature passenger car 84dB Sports car 91dB Motor-cycle (2 cylinder 4 stroke) 94dB Motor scooter (1-cylinder-2-stroke) 80 dB
  11. 11. Environmental Measures  Plantation of trees, shrubs and hedges alongside the road and highway or on the road partitions.
  12. 12. Mitigation - Barriers
  13. 13. THE TOPSIS MODEL  It is based on the concept that the chosen approach should have the shortest distance from the Positive Ideal Solution (PIS) and have the farthest distance from the Negative Ideal Solution (NIS). A fuzzy combination of TOPSIS with some linguistic variables pave the way to make an appropriate decision.
  14. 14. THE RTM(Road Traffic Model) for carrying out the generation of the noise levels along the Indian road  Road traffic noise model rely on the  ◦ ◦ ◦ ◦ volume of vehicles percentage of heavy vehicle the mean speed of vehicles the several road conditions such as height and width of road as well as road gradient.
  15. 15. For a better tomorrow… The Administration and citizens must co-ordinate with each other  optimum CPCB (Central Pollution Control Board) limit of 60 db.  Sustainable development  by observing the present traffic conditions.  This data could be used variety of organizations for generating the noise levels reports for serving variety of purposes. 
  16. 16. THANK YOU!!
  17. 17. YOUR Questions please…
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