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  • Blomqvist, Göran
    Swedish National Road and Transport Research Institute, Society, environment and transport, Environment. VTI.
    GC-salt: karaktärisering av GC-salt och jämförelse med produkten Gatusalt2018Report (Other academic)
    Abstract [sv]

    Vinterväghållning av trottoarer samt gång- och cykelbanor har fått ökad uppmärksamhet de senaste åren. Men, kunskapen, tekniken, strategierna och materialen (salterna) som används i vinterväghållningen springer dessvärre i alltför hög omfattning från decennier av vinterväghållning av bilvägar där processerna skiljer sig stort från det som sker där fotgängare går och cyklister cyklar. Därför har frågan ställts om det salt som vanligen används idag, Gatusalt, vilket är samma halkbekämpningsmedel som används på bilvägar, verkligen är det mest ändamålsenliga att använda även på trottoarer, gångbanor och cykelytor.

    I detta PM testas produkten GC-salt och jämförs med Gatusalt.

  • Kristoffersson, Ida
    et al.
    Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
    Berglund, Svante
    WSP.
    Algers, Staffan
    KTH.
    Estimation of large-scale tour generation model taking travellers' daily tour pattern into account2019Report (Other academic)
    Abstract [en]

    Tour generation is conventionally modelled separately per tour purpose. Tours with different purposes are however not generated independently of each other in reality. For example, few travellers conduct more than three tours per day. In this paper, the conventional tour generation model is extended into estimation of a model that takes travellers’ daily tour pattern into account. Results show that access to car and drivers’ licence, having a job and presence of children in the household increase the probability of making many tours in one day. Furthermore, results show that accessibility is an important factor for generation of non-mandatory tours, that weekend and holiday season are important determinants of when tour purposes are generated, that high income increases the probability of conducting business tours as well as tour patterns that include expensive activities and that high income reduces the probability of conducting cheap activities such as visiting friends and family.

  • Asplund, Disa
    et al.
    Swedish National Road and Transport Research Institute, Society, environment and transport, Transport economics.
    Pyddoke, Roger
    Swedish National Road and Transport Research Institute, Society, environment and transport, Transport economics.
    Optimal pricing of car use in a small city: a case study of Uppsala2019Report (Other academic)
    Abstract [en]

    Studies of cities which successfully have shifted mode choice from car to more sustainable modes, suggest that coordinated packages of mutually reinforcing policy instruments are needed. Congestion charges and parking fees can be important parts of such packages. This paper aims to examine the introduction of welfare optimal congestion charges and parking fees in a model calibrated to Uppsala, a small city in Sweden. The results suggest that welfare optimal congestion charges in Uppsala are as high as EUR 3.0 in the peak hours and EUR 1.5 in the off-peak. In a rough cost-benefit analysis it is shown that the introduction of congestion charges in Uppsala are welfare improving if operating costs of congestion charges are proportional to city population size (compared to Gothenburg). The model can be used to assess when it is worthwhile to introduce congestion pricing.

  • Johansen, Trond Cato
    et al.
    Ramboll.
    Fors, Carina
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Nordic certification of road marking materials in Iceland, Norway and Sweden 2017–20192019Report (Other academic)
    Abstract [en]

    A Nordic certification system for road marking materials, that applies to the countries of Denmark, Iceland, Norway and Sweden, was introduced in 2015. In these countries, a documented product approval is required in order to use a road marking material on roads managed by the national road authorities (Iceland from 2020). Product approval is based on monitored and documented performance measurements of material samples applied on test fields on public roads. The materials are approved (certified) in relation to the number of wheel passages they will stand, with preserved function.

    The certification system includes road marking materials for longitudinal and transverse road markings in categories with respect to colour (white, yellow), type (type I, type II, type II inlaid, antiskid, hand application, non-reflective with enhanced durability, and temporary) and thickness (0.4, 0.6, 1.5, 3 and 5 mm).

    The present report documents the follow-up performance measurements that were carried out at the Norwegian-Swedish test site in 2019, i.e. one-year follow-up measurements for materials applied in 2018 and two-years follow-up measurements for materials applied in 2017. The performance parameters include the coefficient of retroreflected luminance (RL) under dry and wet conditions, the luminance coefficient under diffuse illumination (Qd), the friction, the chromaticity in daylight, and the chromaticity of retroreflected light (yellow materials, only).

  • Johansen, Trond Cato
    et al.
    Ramboll.
    Fors, Carina
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System. VTI.
    Nordic certification of road marking materials in Denmark 2017–20192019Report (Other academic)
    Abstract [en]

    A Nordic certification system for road marking materials, that applies to the countries of Denmark, Iceland, Norway and Sweden, was introduced in 2015. In these countries, a documented product approval is required in order to use a road marking material on roads managed by the national road authorities (Iceland from 2020). Product approval is based on monitored and documented performance measurements of material samples applied on test fields on public roads. The materials are approved (certified) in relation to the number of wheel passages they will stand, with preserved function.

    The certification system includes road marking materials for longitudinal and transverse road markings in categories with respect to colour (white, yellow), type (type I, type II, type II inlaid, antiskid, hand application, non-reflective with enhanced durability, and temporary) and thickness (0.4, 0.6, 1.5, 3 and 5 mm).

    The present report documents the follow-up performance measurements that were carried out at the Danish test site in 2019, i.e. one-year follow-up measurements for materials applied in 2018 and the two years follow-up measurements for materials applied in 2017. The performance parameters include the coefficient of retroreflected luminance (RL) under dry and wet conditions, the luminance coefficient under diffuse illumination (Qd), the friction, and the chromaticity in daylight.

  • Johnsson, Hans
    EQUA Simulation AB.
    Temperaturer i höghastighetsbanornas tunnlar: jämförelse mellan mätningar och beräkningar i befintliga tunnlar2019Other (Other academic)
    Abstract [sv]

    I denna bilaga till: (VTI rapport 1019. "Simulering av typtunnlar på höghastighetsbanan med avseende på kyla och isbildning" av Niklas Wikström och Per Sahlin. 2019) har förutsättningarna för att beräkningsmässigt hantera temperaturpåverkan i tunnlarna i de nya höghastighetsbanorna studerats genom jämförelser mellan mätningar och beräkningar för två befintliga tunnlar.

    Fältmätningar av bl.a. temperatur har under ett flertal år gjorts i Åsatunneln och Glödbergstunneln under ledning av Anna Andén, Trafikverket. Dessa mätningar har jämförts med beräkningsmodeller gjorda med programvaran IDA Tunnel som är en 1-D simuleringsmodell för analys av bl.a. luftrörelser och klimat i järnvägs- och biltunnlar. 

    Avsikten med jämförelserna är att validera IDA Tunnel som verktyg för att beräkna frysning m.m. för de nya tunnlarna som planeras för den nya höghastighetsbanan samt att identifiera områden där modellen behöver förbättras och utvidgas.

    OBS! Börjar på sidan 45!

  • Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Polering av asfaltbeläggning: friktionsmätningar i Stockholmsregionen : 20092010Report (Other academic)
    Abstract [sv]

    För att studera trafikens poleringseffekt av vägytan, har under sommarhalvåret 2009 ett antal asfaltbeläggningar följts upp med avseende på friktion. Arbetet är en fortsättning på flera års mätningar av friktion på ytor som kan tänkas utsättas för polering. Det handlar om högtrafikerade vägar i Stockholmsområdet företrädesvis med slitlager av skelettasfalt (ABS16). Även några slitlager med inblandning av gummi respektive tunnskikt (TSK16) samt dränerande beläggning (ABD16) ingår i undersökningen. Ballasten består av porfyr eller kvartsit samt blandningar av porfyr och kvartsit eller porfyr och ortens material.

    Mätningarna följer Vägverkets metodbeskrivning för bestämning av friktion på belagd vägyta och avser våtfriktionen vid barmarksförhållanden. Vid mätningarna har VTIs friiktionsmätbil "SAAB Friction Tester" använts. Friktionen har mätts i högra hjulspåret.