Regional influence on the occurrence of road slipperiness during winter precipitation events

Eriksson, Marie

doi:10.1017/s1350482701004066

Cited by 12 publications

(9 citation statements)

References 13 publications

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“…It was hence decided that the present study should focus on frost, rather than other types of weather warnings. Substantial amounts of frost may lead to reduced friction, as described by Eriksson (2001) who found a correlation between increased difference of frost point temperature and road surface temperatures with decreased friction. Several studies have also described the correlation between reduced friction and traffic accidents (Norrman et al, 2001;Andersson and Chapman, 2011).…”

Section: Road Frost In Southwestern Swedenmentioning

confidence: 83%

Optimization of winter road maintenance energy costs in Sweden: a critique of site specific frost warning techniques

Riehm

Nordin

2011

Meteorological Applications

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Frost formation on roads may cause slippery conditions and thereby increase the risk of accident occurrence. Roads are often treated with preventive operations using de-icing agents (e.g. road salt), which are ideally planned and performed prior to frost formation. The decisions on when and where to treat different road stretches with salt are based on meteorological measurements and forecasts. This paper investigates how uncertainties in meteorological measurements for frost prediction at road weather stations affect the efficiency of winter road maintenance. Different types of uncertainties and errors are discussed, together with potential solutions. The effects on winter road maintenance efficiency are discussed in terms of energy and cost. It was found that improvements in frost warning accuracy and reliability can lead to considerable savings and more efficient winter road maintenance.

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Section: Road Frost In Southwestern Swedenmentioning

confidence: 83%

Optimization of winter road maintenance energy costs in Sweden: a critique of site specific frost warning techniques

Riehm

Nordin

2011

Meteorological Applications

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“…South of the mountain chain, temperatures were warmer as a result of the Foehn effect, exceeding 0°C at lower altitudes. It is common that freezing precipitation episodes are preceded by temperatures near −10°C [ Eriksson , ].…”

Section: Mesoscalementioning

confidence: 99%

Analysis of a seeder‐feeder and freezing drizzle event

et al. 2015

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Surface icing can cause dramatic consequences on human activities. What is more, numerical weather prediction models are not very accurate in determining freezing drizzle, which creates uncertainty when forecasting this type of weather phenomenon. Therefore, it is essential to improve the forecast accuracy of these models for such phenomena to mitigate risks caused by unforeseen freezing drizzle events. On 5 February 2012, an episode of freezing drizzle took place in the Guadarrama Mountains, at the center of the Iberian Peninsula. This episode was preceded by weak snowfall. After the freezing drizzle, moderate snowfall was recorded in the study area. This event was simulated using the Weather Research and Forecasting model. Through this analysis, we identified the meteorological factors at both synoptic scale and mesoscale that caused this episode. Wind perpendicular to an orographic barrier‐generated updrafts and retention of moisture upwind, which caused orographic clouds to appear on the north side of the Guadarrama Mountains. Atmospheric stability prevented cloud formation at midlevels at the time of the freezing drizzle, which maintained cloud top temperatures warmer than −15°C during the episode. The entrance of moisture and instability at midlevels caused cloud top temperatures substantially colder than −15°C, which coincided with snow in the mountain range. Cloud top temperature and thickness control the efficiency of the glaciation process, thereby determining the type of precipitation at the surface. Freezing drizzle risk and in‐cloud icing algorithms were developed with the aim of predicting similar events in the study area, which could mitigate impacts on human activities.

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“…Each country has specific climate, characteristic only to this particular country, for example, the most topical data for Great Britain is air temperature, precipitation and wind. Sweden (Eriksson, Lindqvist 2002) pays large attention to information about specific climatic conditions in winter when at the same time precipitation and positive air temperature are observed, and a road surface temperature is lower or equal to 0 °C. Road organizations of many countries use maps compiled by meteorological services based on the multi-year data of World Meteorological Organization (WMO).…”

Section: Experience Of Climatic Distribution Of Regionsmentioning

confidence: 99%

Evaluation of possibilities for the climatic distribution of regions from the point of view of road construction

Juknevičiūtė-Žilinskienė

Laurinavičius

2015

The Baltic Journal of Road and Bridge Engineering

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Seeking to reduce a negative impact of unfavourable weather conditions on road traffic, many countries introduce modern technologies allowing to objectively assessing meteorological conditions of roads. The world over, data from the automated meteorological stations of Road Weather Information System have been long ago used on a significantly larger scale than only for the organization of road maintenance works. International experience of introducing Road Traffic Information Systems in European Union and other countries of the world shows that Road Weather Information Systems give good results for increasing road safety, improving the level of road user information and solving the road construction issues. Road Weather Information System is a system of technologies and decision-making using historical and real-time data of roads and weather conditions. The collected and processed multi-year data from meteorological stations is a great assistance in designing or reconstructing road pavement structures. Road pavement structure is highly affected by a negative air temperature and frozen ground. The impact of negative temperature is expressed by the thickness of frost blanket course. The thickness of frost blanket course depends on a frost susceptibility of soil. To determine the thickness of frost blanket course it is necessary to assess the frost impact, therefore it was up to the purpose − climatic distribution of regions the territory of Lithuania according to the distribution of frost impact and the depth of frozen ground. Based on climatic maps compiled, a correction of the thickness of road pavement structure was suggested.

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Regional influence on the occurrence of road slipperiness during winter precipitation events

Cited by 12 publications

References 13 publications

Optimization of winter road maintenance energy costs in Sweden: a critique of site specific frost warning techniques

Optimization of winter road maintenance energy costs in Sweden: a critique of site specific frost warning techniques

Analysis of a seeder‐feeder and freezing drizzle event

Evaluation of possibilities for the climatic distribution of regions from the point of view of road construction

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