This document discusses different sources of noise pollution from road traffic, including noise generated by vehicles' engines, exhaust, brakes, horns, and chassis, as well as door slamming. It notes that noise levels depend on traffic speed, flow and density. The document also mentions that sound level meters are used to measure acoustic noise and lists strategies for controlling access to roads like overpasses and underpasses to allow for unhindered traffic flow.

1. Noise pollution

2. Noise pollution

3. Traffic Jam

4. Generation of Noise by Road Traffic
• Noise generated by various parts of the vehicle
• Noise contributed by the interaction between the
vehicle and the road surfaces
• Noise dependent on the speed, flow and density
of traffic
• Important source – Vehicle itself

6. Elements contribute to Vehicle Noise
• Engine (power unit) especially during acceleration
• Inlet
• Exhaust
• Propulsion and transmission including gears
• Brakes
• Horns
• Chassis
• Loads in the vehicle
• Door slamming

7. Vehicle Emission

8. Vehicle Exhaust

11. Horns

12. Chassis

13. Door Slamming

14. Sounds

17. Sound Level Meter
• A sound level meter is used for acoustic (sound
that travels through air) measurements. It is
commonly a hand-held instrument with a
microphone.

20. Canyon effect

22. Air pollution

23. 23

28. 28

29. 29

30. Vibration

35. Control of Access
• A controlled-access highway provides an
unhindered flow of traffic, with no traffic signals,
intersections or property access. They are free of
any at-grade crossings with other roads, railways,
or pedestrian paths, which are instead carried by
overpasses and underpasses.