Effects of Pavement Skid Resistance on Traffic Accidents

Al‐Mansour, Abdullah I.

doi:10.24200/tjer.vol3iss1pp75-78

Cited by 14 publications

(6 citation statements)

References 3 publications

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“…Kuttesch showed skid resistance to be a significant factor in modeling wet accident rates in Virginia (6). Al-Mansour showed that pavements with FN values below 35 had the highest accident rates (7). Those rates stabilized as FN exceeded 45.…”

Section: Crash Analysismentioning

confidence: 96%

Specifications for Aggregate Frictional Qualities in Flexible Pavements

Schram¹

2011

Transportation Research Record: Journal of the Transportation R

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and granite) for their polish-resistant qualities. An alternative is to limit known polishing aggregates or those aggregates that have not historically demonstrated acceptable friction in the field. Illinois, Missouri, and Wisconsin are among the states bordering Iowa that limit the quantity of carbonate aggregates (commonly limestone and dolomite) in surface mixes for high-volume facilities. An important component of a frictional classification system is defining the properties used to distinguish an aggregate's frictional qualities. Some agencies qualify noncarbonates as meeting a minimum percentage of acid-insoluble residues, whereas others qualify material by source. The Iowa Department of Transportation (DOT) classification system defining the frictional qualities of aggregates is provided in Table 1 (3).Aggregates that provide the greatest frictional qualities may not be locally available. Therefore, specification limits should be established to meet friction demand while economically providing maximum use of local materials. A recent study of 23 test sites in Iowa and Indiana found that asphalt mixtures containing a large quantity of polishsusceptible aggregates should be blended with at least 20% coarse frictional aggregate. The study also suggests that a fineness modulus of the total blend that is greater than 4.6 will improve frictional properties (2). Verification of these conclusions is needed. To validate these conclusions, a desirable friction level must be established (2). RESEARCH OBJECTIVE AND APPROACHThis study was done to validate the classification system used by the Iowa DOT to establish frictional qualities of aggregates used in asphalt surface mixtures. An equally critical objective was to confirm whether desirable friction levels are being demonstrated in the field at the current minimum requirements for polish-resistant aggregates. To meet these objectives, the study was divided into two phases. The first phase defined a desirable level of friction for Iowa Interstates. Friction measurements were correlated with crash records on pavement sections for which asphalt mixture data were available. The data set spanned 30 years and contained mixtures with a wide range of frictional aggregate types, sizes, sources, and gradations at various quantities. The study scope was limited to Interstate pavements.The second phase used the desirable friction level to determine the adequacy of current specification limits. To carry this out, job mix formulas were evaluated by both the proportion of polishresistant aggregates and their ability to demonstrate desirable friction levels in the first 5 years of service. Limits were then modified as necessary to ensure desirable friction was achieved in the field.Asphalt mixtures can be engineered to meet a pavement facility's surface friction demands. Researchers recommend laboratory testing on mixtures and aggregates to ensure desirable friction in the field. Some state highway agencies use this testing, and other agencies specify properties related to the aggr...

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Section: Crash Analysismentioning

confidence: 96%

Specifications for Aggregate Frictional Qualities in Flexible Pavements

Schram¹

2011

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

show abstract

“…In Saudi Arabia Al-Mansour [24] investigated the effects of pavement skid resistance on traffic accidents. The analysis included establishing relationships between skid resistance and accident number, accident significance and accident density.…”

Section: Evaluation Of Previous Studies and The Importance Of Skid Rementioning

confidence: 99%

“…A critical value of skid resistance was also established based on number, significance and density of accidents. As Al-Mansour [24] indicated, there are no standards agreed upon which define minimum acceptable skid resistance levels. Several studies have been conducted to develop criteria for critical skid resistance levels.…”

Section: Evaluation Of Previous Studies and The Importance Of Skid Rementioning

confidence: 99%

Investigation of the Skid Resistance at Accident Occurred at Urban Intersections

Saplıoğlu¹,

Yuzer²,

Aktaş³

et al. 2013

JTTE

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Skid resistance of road surface plays an important role on urban traffic accidents. It is thought that reduction of surface microtexture leads to reduced skid resistance. Hence, it affects driving safety negatively and may cause traffic accidents. This paper is about the effect of skid resistance and intersection safety. Urban four leg signalized intersections were selected from Isparta city. The surface frictional properties were measured and it was tried to find critical skid resistance value with the help of British Pendulum Tester. Macro texture values of the intersections were determined with Sand Patch test and concluded that surface macro texture contributes to skid resistance. An analysis technique based on probability theory has been used. This method is used for expounding the interaction between skid resistance-intersection and accident rates. After the study results are evaluated, it is understood that pavement roughness is very important for urban intersection safety measures.

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“…Wet pavement accidents and a total number of accidents were used to study the relationships between MATEC Web of Conferences 192, 02049 (2018) https://doi.org/10.1051/matecconf/201819202049 ICEAST 2018 pavement skid resistance and a total number of wet pavement accidents on major highways in the Kingdom of Saudi Arabia [7]. It was concluded that the number of accidents approaches almost a constant number at a skid number greater than 0.45.…”

Section: Road Accident and Skid Resistancementioning

confidence: 99%

A correlation between pavement skid resistance and wet-pavement related accidents in Thailand.

2018

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Abstract. This research aims to study a correlation between a pavement skid resistance and wet-pavement related accidents in order to determine the minimum friction threshold so called 'Investigatory Level (IL)' for the roads in Thailand. An accident database, a skid resistance database and a traffic volume of road network from the department of Highways, totalling 19 routes and 386kilometers, were used in the analysis of this study. In the analysis, 500-meter subsection intervals are used to determine a correlation between an average pavement skid resistance and wet-pavement accident rate using a non-linear regression analysis model. It was discovered that the pavement skid resistance has a major influence on the accident rate, depending on various types of road geometry. Moreover, the preliminary investigatory level is determined by using a past accident rate information as a reference for an investigatory level basis. We discover that the single carriageway (non-event) road is at highest threat due to low pavement skid resistance. The recommended investigatory level for each of the five road geometries all site, single carriageway, dual carriageway, horizontal alignment and curve road categories are 035, 0.50, 0.30, 0.30, and 0.40, respectively, which are in accordance to the investigatory level values in other countries.

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Effects of Pavement Skid Resistance on Traffic Accidents

Cited by 14 publications

References 3 publications

Specifications for Aggregate Frictional Qualities in Flexible Pavements

Specifications for Aggregate Frictional Qualities in Flexible Pavements

Investigation of the Skid Resistance at Accident Occurred at Urban Intersections

A correlation between pavement skid resistance and wet-pavement related accidents in Thailand.

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