Everything about Roadway Noise totally explained
Roadway noise is the collective sound energy emanating from
motor vehicles. In the USA it contributes more to environmental noise exposure than any other noise source, and is constituted chiefly of
engine,
tire,
aerodynamic and braking elements. In other Western countries as well as
Lesser developed countries, roadway noise is expected to contribute a proportionately large share of the total societal
noise pollution.
History
Roadway noise began to be measured in a widespread manner in the 1960s, when
computer modeling of this phenomenon was perfected. After passage of the
National Environmental Policy Act and
Noise Control Act, the demand for detailed analysis soared, and decision makers began to look to acoustical scientists for answers regarding the planning of new roadways and the design of
noise mitigation.
Partial bans on motor vehicles from urban areas have been shown to have minimal impacts upon reducing sound levels (as would become clear from later modeling studies); for example, the partial ban in
Gothenburg, Sweden resulted in minuscule reduction of sound levels.
Description of basic variables
The intensity of roadway noise is governed by the following variables:
traffic operations (speed,
truck mix, age of
vehicle fleet), roadway surface type, tire types, roadway geometrics, terrain, micrometeorology and the geometry of area structures.
Traffic operations noise is affected significantly by vehicle speeds, since sound energy roughly doubles for each increment of ten miles an hour in vehicle velocity; an exception to this rule occurs at very low speeds where braking and acceleration noise dominate over aerodynamic noise. Small reductions in vehicle noise occurred in the 1970s as states and provinces enforced unmuffled vehicle ordinances. The vehicle fleet noise hasn't changed very much over the last three decades; however, if the trend in
hybrid vehicle use continues, substantial noise reduction will occur, especially in the regime of traffic flow below 35 miles per hour. As a pedestrian safety issue, hybrid vehicles are so quiet at low speeds that the customary warning noise may not alert the pedestrian to nearby danger, creating a potential hazard for visually-impaired people, who rely on such noise to navigate in areas of heavy traffic. Trucks contribute a disproportionate amount of noise not only because of their large engines, but also the height of the diesel stack and the aerodynamic drag. Significant interior noise is usually present inside moving motor vehicles; in fact, passengers are generally not aware that these levels are high, because experience has led motorists to expect levels commonly exceeding 65
dBA.
Roadway surface types contribute differential noise effects of up to 4 dB, with chip seal type and grooved roads being the loudest and
concrete surfaces without spacers being the quietest.
Asphaltic surfaces are about average.
Tire types had considerable design changes in the 1970s, and at this juncture are probably optimized for noise control, given the of safety needs for a significant grip by the tread.
Roadway geometrics and surrounding
terrain are interrelated, since the propagation of sound is sensitive to the overall geometry and must consider
diffraction (bending of sound waves around obstacles),
reflection,
ground wave attenuation, spreading loss and
refraction. A simple discussion indicates that sound will be diminished when the path of sound is blocked by
terrain, or will be enhanced if the roadway is elevated so as to broadcast; however, the complexities of variable interaction are so great, that there are many exceptions to this simple argument.
Micrometeorology is significant in that sound waves can be
refracted by
wind gradients or
thermoclines, effectively dismissing the effect of some
Noise barriers or terrain intervention.
Geometry of area structures is an important input, since the presence of buildings or walls can block sound under certain circumstances, but reflective properties can augment sound energy at other locations.
Computer models for roadway noise
Because of the complexity of the variables discussed, it's necessary to create a
computer model that can analyze sound levels in the vicinity of roadways. The first meaningful models arose in the late 1960s and early 1970s addressing the noise
line source (for example roadway). Two of the leading research teams were
BBN in
Boston and
ESL of
Sunnyvale, California. Both of these groups developed complex
mathematical models to allow the study of alternate roadway designs, traffic operations and
noise mitigation strategies in an arbitrary setting. Later model alterations have come into widespread use among state
Departments of Transportation and city planners, but the accuracy of early models has had little change in 40 years.
Generally the models trace sound ray bundles and calculate spreading loss along with ray bundle divergence (or convergence} from refractive phenomena. Diffraction is usually addressed by establishing secondary emitters at any points of topographic or anthropomorphic “sharpness” (such as
noise barriers or building surfaces). Meteorology can be addressed in a statistical manner allowing for actual
wind rose and
wind speed statistics (along with thermocline data).
Case studies
An interesting early case where two of the leading models were pitted against each other involved a proposed widening of the New Jersey Turnpike from six to twelve lanes. The
BBN and
ESL models were on opposing sides of a matter decided in
New Jersey Superior Court. This case in the early 1970s was one of the first U.S. examples of acoustical scientists playing a role in the design of a major highway. The models allowed the court to understand the effects of roadway geometry (width in this case), vehicle speeds, proposed
noise barriers,
residential setback and pavement types. The outcome was a compromise that involved substantial mitigation of
noise pollution impacts.
Another early case involved the proposed extension of
Interstate 66 through
Arlington, Virginia. The
plaintiff,
Arlington Coalition on Transportation sued the
Virginia Department of Transportation on the grounds of
air quality, noise and neighborhood disruption. To analyze roadway noise, the ESL model was used by the plaintiff, who won this case partially due to the credibility of the
computer model. The matter was revisited a decade later and a greatly reduced highway design with transit element and extensive noise mitigation was agreed to.
Later cases have occurred in every state, both in contentious actions and in routine highway planning and design. The public as well as governmental agencies have become aware of the value of acoustical science to provide useful insights to the roadway design process.
Worldwide perspective
European technology began to emulate the United States treatment of roadway noise by the 1980s, although the national requirements of noise studies generally remain less stringent than the U.S. In developing countries
noise pollution from motor vehicles represents a significant impact, but technologies are not as advanced as in Western nations. For example, a recent paper from
Iran illustrates a level of technology that the United States encountered in the 1960s. The European Union has recently proposed a set of vehicle tire requirements, similar to those introduced in the U.S. in the 1970s.
References
Further Information
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