Räfflor: effekter och konsekvenser av olika räffeltyper vid mitträffling på 2-fältsvägar

Download

Milled rumble strips is one way to attract the drivers’ attention when they involuntarily are about to leave the lane. The rumble strips provide both internal and external noise but also vibrations in the vehicle. The overall aim of this work is to elucidate the effects and consequences of the use of intermittent milled rumble strips compared to sinus milled rumble strips in the center of the road. The comparison take into account; external noise, internal noise, vibrations, damage to the road surface and the price. However, due to lack of data, vibrations and price issues are excluded here. The results show that the intermittent rumble strips provide an increase of external noise on the 2–8 dB (A). The corresponding figure for the sinus rumble strip is 0.0 to 4 dB (A). Further, it is found that the sinus rumble strips provide more low frequency noise (30–40Hz) compare to the intermittent rumble strips (60–160 Hz). Maximum noise from intermittent rumble strips are obtained around 80–90 km/h, and at 90 km/h the threshold for noise for those living close to the road is 90–140 meters. It is not known at what speed the sinus rumble strip provide the maximum noise. Regarding the internal noise most studies have focused on passenger cars and an increase in internal noise when driving on intermittent rumble strips varies between 13–17 dB (A). Results from simulator studies show that even low levels of internal noise is helpful for drivers who are about to leave the lane due to sleepiness. The sinus rumble strips provide not only noise but also vibrations.

MEET US


7
Dec

Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.

LATEST NEWS


2017-10-16

ERPUG Forum

The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


2017-09-29

Self-driving buses in Sweden next year?

A self-driving, fossil-free bus. This idea might become reality through a forthcoming collaborative project involving the Swedish National Road and Transport Research Institute (VTI), Linköping University and several other participants. The project group aim...


2017-09-29

New climate-proof solutions for hard surfaces in cities

High-density road infrastructure that emphasise maximum durability and minimum maintenance create inflexible systems, which put increased stress on urban trees and lead to increased risk for flooding. Over the past five years, the ‘Climate-proof solutions for...


2017-09-29

VTI is preparing for automated vehicles

Automation of traffic systems will lead to major changes. The European Union’s (EU) CoEXist research project began in June 2017 with the aim of preparing cities and road operators for the introduction of self-driving vehicles. The Swedish National Road and...


2017-07-05

Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


2017-06-29

Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017.