Energieffektivitet hos beläggningar för tyngre trafik: En litteraturöversikt

Annelie Carlson
Jonas Wennström

It is important to study traffic energy efficiency since small changes can have major effects over the road’s service life. Vehicle driving resistance was studied in this project and, in particular, its rolling resistance - the part of the driving resistance connected to the interaction between tyre and road surface. Depending on driving conditions and vehicle type, the rolling resistance corresponds to 5–40 percent of the total driving resistance.

It has been observed in studies that road surface properties such as texture (Mean Profile Depth, MPD) and unevenness (International Roughness Index, IRI) have an impact on rolling resistance. However, the significance varies between different analyses. The variation in the results may be due to difficulties in performing comparable tests and that it is often difficult to isolate the effect of texture and unevenness during the tests. In addition, pavement stiffness and deflection may also have an effect on rolling resistance. However, the impact from these parameters is unclear.

The higher the driving resistance of a vehicle, the higher the energy needed. Earlier studies examined how vehicle fuel consumption varied between driving on concrete roads and asphalt roads. Although several of these studies showed a lower fuel consumption when driving on concrete roads, most of them did not consider the pavement surface characteristics. This is a significant shortcoming because pavement surface characteristics can have a considerable effect on rolling resistance.

Reducing rolling resistance on high-traffic volume roads will lead to greater fuel savings. However, these measures need to be weighed against the amount of energy needed to achieve a lower rolling resistance. Compared case studies also show that it is often beneficial to invest more energy on the maintenance measure itself if it can lead to a lower rolling resistance, compared to a less comprehensive maintenance measure leading to a higher rolling resistance.



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