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  • 1.
    Anund, Anna
    Statens väg- och transportforskningsinstitut, Samspel människa, fordon, transportsystem, MFT.
    Räfflor: effekter och konsekvenser av olika räffeltyper vid mitträffling på 2-fältsvägar2014Report (Other academic)
    Abstract [en]

    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.

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  • 2.
    Anund, Anna
    et al.
    Statens väg- och transportforskningsinstitut, Samspel människa, fordon, transportsystem, MFT.
    Fors, Carina
    Statens väg- och transportforskningsinstitut, Samspel människa, fordon, transportsystem, MFT.
    Eriksson, Jennie
    Occas AB.
    Utvärderingsmodell för ITS-baserade system vid hållplats: kunskapsöversikt och förslag på forskningsbehov2015Report (Other academic)
    Abstract [sv]

    Det finns nya produkter av typen varningssystem som syftar till att öka säkerhet och trygghet för oskyddade trafikanter. De har ofta tagits fram med särskilt fokus på barn. Produktutvecklarna har utvärderat sina produkter med positiva resultat och intresset hos Trafikverket och kommuner är stort för flera av dessa produkter. En typ av system är utmärkning vid hållplatser där blinkande ljus aktiveras när det finns oskyddade trafikanter i närheten, ett så kallat ITS-baserat varningssystem. Det finns idag ett antal platser i landet där sådana anläggningar är i bruk som ”försök” och det har skett utvärderingar av valda system vid hållplats som visat att systemen sannolikt är effektiva när det gäller att reducera hastigheten hos förbipasserande. Det finns dock en avsaknad av ett samlat utvärderingsupplägg. Avsaknaden av systematisk utvärdering har bidragit till bristen på formella beslut för att integrera denna typ av produkt i Vägar och Gators Utformning, VGU eller i Trafiklagstiftningen. I Trafikverkets region Stockholm har man utifrån resenärernas behov och i samarbete med kommunerna kring glesbygdsproblematik, särskilt intresse i att dessa produkter blir möjliga att använda. En förutsättning för detta är en systematisk utvärdering med avseende på om ett specifikt system fyller den funktion som det var avsett att fylla.

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  • 3.
    Anund, Anna
    et al.
    Statens väg- och transportforskningsinstitut, Samspel människa, fordon, transportsystem, MFT.
    Forsberg, Inger
    Statens väg- och transportforskningsinstitut, Mobilitet, aktörer och planering, MAP.
    Ihlström, Jonas
    Statens väg- och transportforskningsinstitut, Samspel människa, fordon, transportsystem, MFT.
    Nykterhetsstödjande system: diskussioner i fokusgrupper2014Report (Other academic)
    Abstract [en]

    There is a common understanding that driving under the influence of alcohol is associated with higher risk of being involved in crashes with injuries and possible fatalities as outcome. The aim with this study was to understand drivers’ vision of a future vehicle integrated system for alcohol detection. Eight focus groups with in total 47 participants representing different stakeholders were recruited and conducted for the purpose. The groups represented young drivers (18–19 years old), males (30–60 years old), females (30–60 years old), elderly (70–90 years old), former alcohol addicts, one group represented authorities and finally one represented retailors and rental car companies. The analysis was based solely on the transcriptions and the analysis was performed using inductive content analysis. The results show a clear view that such future vehicle integrated system will benefit a large group of drivers. They said that the system would probably mainly prevent driving by people who unintentionally and unknowingly drive under the influence of alcohol. The groups did, however, not regard the system as a final solution for the drunk driving problem, and believed that certain groups, such as criminals and alcoholics, would most likely find a way around the system. From the drivers point of view the system most truly should be invisible for the drivers. Feedback to the driver was seen as justified at levels below the legal limit, but not for levels above the limit: for those, the system should simply prevent the car from starting. Feedback should be given through sound or as a visual feedback. Reliability and trust to the system was rated as very important, and it was underlined that it was important that it was the drivers BAC that was detected not the passengers.

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  • 4.
    Sjörs Dahlman, Anna
    et al.
    Statens väg- och transportforskningsinstitut, Trafikanttillstånd, TIL.
    Anund, Anna
    Statens väg- och transportforskningsinstitut, Trafikanttillstånd, TIL.
    Utvärdering av trötthetsvarningssystem i buss2020Report (Other academic)
    Abstract [en]

    Previous studies have shown that it is common for bus drivers in public transport to struggle to stay awake several times a month. Several systems for detecting fatigue in drivers are currently available, but how these types of systems affect and are perceived by bus drivers is not known. The purpose of the study was to evaluate a fatigue warning system for use in long-distance buses. The study comprises two sub-studies; a survey and an on-road evaluation of the fatigue warning system. The survey showed that the factors that were considered the most tiring were driving at night, irregular working and sleeping hours and spread-over shifts/long time since a break. 29% of the drivers stated that they had to fight to stay awake when driving a bus 2–4 times/month or more. The on-road study showed that self-rated sleepiness was slightly lower when the fatigue warning system was active. The logs of fatigue events from the fatigue warning system and the drivers' reports of received warnings did not match their perceived fatigue. The drivers were generally positive about the fatigue warning system but emphasized that the system needs to be more reliable.

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  • 5.
    Vadeby, Anna
    et al.
    Statens väg- och transportforskningsinstitut, Trafiksäkerhet och trafiksystem, TST.
    Anund, Anna
    Statens väg- och transportforskningsinstitut, Trafikanttillstånd, TIL.
    Ekström, Camilla
    Statens väg- och transportforskningsinstitut, Trafiksäkerhet och trafiksystem, TST.
    Gustafsson, Susanne
    Statens väg- och transportforskningsinstitut, Trafiksäkerhet och trafiksystem, TST.
    Lundberg, Thomas
    Statens väg- och transportforskningsinstitut, Drift och underhåll, DOU.
    Olstam, Johan
    Statens väg- och transportforskningsinstitut, Trafikanalys och logistik, TAL.
    Tapani, Andreas
    Statens väg- och transportforskningsinstitut, Trafikanalys och logistik, TAL.
    Säker framkomlighet: sammanfattande slutrapport 20152016Report (Other academic)
    Abstract [en]

    This report consolidates evaluations performed within the project “Safe accessibility” on behalf of the Swedish Transport Administration. Four different measures implemented on rural roads in Sweden with the aim to increase traffic safety and improve accessibility are investigated. The measures are; milled centerline rumble strips on rural 2-lane roads, shoulder rumble strips on motorways, narrow2+1 roads with median barrier and divided roads (painted 2+1 roads with median rumble strips).As regards traffic safety, all four measures show reductions in the number of fatalities and seriously injured. For milled centerline rumble strips on rural 2-lane roads, they do not have a confining effect on traffic and have no adverse effect on the rate of rutting. For barrier separated roads (2+1), the results indicated that for Average Annual Daily Traffic (AADT) levels greater than 8,000 vehicles, the annual rut depth development rate is about 25 percent higher than for conventional rural roads. With lower AADT levels, differences reduced to between 10–15 percent. Comparisons between divided roads and conventional roads only showed higher annual rut development rates for AADT levels greater than 8,000 vehicles. A study about the effects and consequences of different types of milled rumble strips showed that there are no known arguments for not using the sinus rumble strips. However, further studies on the impact of drivers of heavy vehicles are recommended. Studies of the effect on traffic efficiency showed that the proportion of Heavy Goods Vehicles (HGVs) is an important factor to consider in the design of narrow 2+1 roads and the proportion of HGVs need to be taken into account in the selection of the length of overtaking lanes.

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    FULLTEXT01
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