Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Slow speed - less dust

13.03.2008
If an automobile with studded tyres drops its speed from 50 to 30 km/hour, the amount of dust it kicks up is cut in half, a researcher at the Norwegian University of Science and Technology (NTNU) has shown.

There’s a fierce debate in Trondheim, NTNU’s home, as to whether the speed limit in the centre of the city should be dropped from 50 to 30 kilometres per hour. The arguments for lowering the speed limit are many – better air quality is just one of them. But until now, there hasn’t been any concrete information about the effect that lower speeds have on the amount of fine dust on the roads.

NTNU researcher Brynhild Snilsberg has examined the occurrence of fine dust in the summer and winter from winter tyres, summer tyres and studded tyres – and has measured the amount of dust associated with different speeds.

Her results show that the amount of road dust from studded tyres is halved when speeds drop from 50 to 30 km/hour. The dust particles are also less finely ground.

Fast studs, fine dust

“In general, it turns out that the amount of dust that is produced and kicked up increases proportionally with the speed, so that the amount increases from about 2.5 milligrams per cubic metre of air at speeds of 30 km/hr, to a little over 5, at 50 km/hr”, says Snilsberg.

“Also, the particles are on the whole much smaller with higher speeds. The increased speed enables the studs to grind the dust more finely”, explains Snislberg.

“That’s a strong argument for reducing the speed limit in the city, particularly in the winter months”, says the researcher.

Stronger than expected

Snilsberg says she wasn’t surprised to find the trend. “But I didn’t think it would be so strong”, she says.

Roughly three of 10 automobiles in Trondheim are outfitted with studded tyres. Consequently, a halving of the amount of fine dust caused by studded tyres will have a considerable effect on the total amount of dust in the city centre. The national average for the use of studded tyres is 45 per cent.

The problem with road dust from studded tyres is increasing, as both the amount of traffic and the demand for ice- and snow-free roads increase. That means that roads in residential areas outside of the city centre and the more built-up areas will also be affected by this nuisance.

A need for better measurements

The dust in question is called PM 10, particulate matter that is 10 micrometres or less in diameter. The current measurement requirements, which are EU certified, are based exclusively on weight. That isn’t a very adequate standard, Snilsberg believes.

“If you have one particle that’s one milligram on the one hand, and a thousand fine particles that together weigh the same on the other, there’s no doubt as to which is more harmful to your health. But we don’t have any better alternative when it comes to measuring and monitoring air quality in Norwegian cities”, she says.

Snilsberg took her PhD at the Department of Geology and Mineral Resources Engineering at NTNU, and conducted her research at the Norwegian Public Roads Administration.

By Tore Oksholen/Gemini

Nina Tveter | alfa
Further information:
http://www.ntnu.no

More articles from Transportation and Logistics:

nachricht Tool helps cities to plan electric bus routes, and calculate the benefits
09.01.2017 | International Institute for Applied Systems Analysis (IIASA)

nachricht Realistic training for extreme flight conditions
28.12.2016 | Technical University of Munich (TUM)

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Researchers shoot for success with simulations of laser pulse-material interactions

29.03.2017 | Materials Sciences

Igniting a solar flare in the corona with lower-atmosphere kindling

29.03.2017 | Physics and Astronomy

As sea level rises, much of Honolulu and Waikiki vulnerable to groundwater inundation

29.03.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>