Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

Loprencipe, Giuseppe; Zoccali, Pablo

doi:10.3390/coatings7050059

Cited by 39 publications

(21 citation statements)

References 25 publications

(45 reference statements)

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“…where W k,I are the frequency weightings in one-third octave bands for seated position, provided by the standards, and a iz is the vertical RMS acceleration for the i-th one-third octave band. This method ( Figure 3) allowed the evaluation of the vertical accelerations in order to analyze the comfort of car passengers [39,45,46].…”

Section: Methodsmentioning

confidence: 99%

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Loprencipe¹,

Moretti²,

Pantuso³

et al. 2019

Applied Sciences

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In urban areas traffic-calming strategies and pedestrian friendly measures are often adopted to reduce the adverse impacts of motor vehicles on vulnerable users. This study surveyed 24 raised pedestrian crossings (RPCs) to examine their geometrical and functional characteristics. Geometric characteristics, location, administrative and effective vehicle speed, and the whole-body vibration acceleration induced to vehicle occupants while they are passing over, were considered. In addition to the analysis of the field data, geometrical and functional criteria to design RPCs were carried out. Particularly, two design approaches have been considered. In the first one, RPC provides a designated route across a carriageway raised to the same level, or close to the same level, as the sidewalks that provide access to the pedestrian crossing. In such condition, an RPC is not a traffic-calming device and its design should satisfy geometrical and comfort criteria for designing roads. The results from the surveys demonstrated that less than 10% of RPCs guarantee ride comfort. According to the second design approach, an RPC acts both as a marked pedestrian feature and as a traffic-calming device (i.e., it is trapezoidal in shape with sharp edges). The analysis of the vertical accelerations on vehicle occupants reveal that more than 90% of the surveyed RPCs comply with geometrical and dynamic criteria for speed tables. Extreme variations concerning the observed geometrical characteristics of RPCs and the modelled dynamic performances have been observed: It results in noneffective treatments. Therefore, the results of this study would contribute to providing geometric best practices for overcoming the regulation gap in this subject, and designing RPCs according to international standards. pedestrian infrastructures is increasing [15,16]. Over the years, different systems have been adopted to reduce the risk of vehicle-pedestrian collisions, especially in urban areas. Speed control undulations (SCUs) are traffic-calming units that aim to increase pedestrian safety, as well as reduce noise and pollution from traffic in residential areas.Undulations are usually installed on residential, local, or collector roads; at any rate, these urban roads should not have buses, emergency traffic or, in general, heavy traffic, and should have an administrative speed limit of 20 or 30 km/h [5,17]. A warning sign with an adequate speed limit sign should be installed before an undulation [1,18]. When 15% of traffic exceeds the speed limit by 8-16 km/h the enforcement band is not effective [19], and the road manager could evaluate the installation of SCUs and/or other traffic-calming systems.Raised pedestrian crossings (RPCs) are used in urban areas to increase the walkability of neighborhoods [20] and to reduce the probability of pedestrian injuries and fatalities after a crash, either within specific traffic-calming programs, or more generally within Sustainable Urban Mobility Plans, with increased road safety being one of the main priorities in th...

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Section: Methodsmentioning

confidence: 99%

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Loprencipe¹,

Moretti²,

Pantuso³

et al. 2019

Applied Sciences

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“…Driving is a very involved process that heavily relies on the driver's competence behind the wheel (AASHTO, 2010b). Drivers are also heavily influenced by their surroundings (Hauer, 2000), including the discomfort due to vibrations as a result of a rough road surface (Loprencipe & Zoccali, 2017). Road roughness has been linked to increase stress in vehicle structures, increase in the dynamic loads applied to pavement structures accelerating fatigue damage, and decrease in road vehicle-interactions such as steering and braking (Sayers & Karamihas, 1998).…”

Section: Road Roughness and Iri Thresholdsmentioning

confidence: 99%

Assessing pavement conditions and their effect on road safety: Ontario experience

Nemtsov¹

2021

Preprint

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The increasing need to rebuild and repair Ontario highways has motivated this research aimed at maximizing the efficiency of pavement maintenance and design. The first of two complementary objectives were to evaluate the safety improvements of reduced pavement roughness on two-lane undivided Ontario highways using the Empirical Bayes and Cross-Sectional analysis methods. The second objective was to improve the prediction of pavement distress and surface roughness by examining the impact of local calibration of prediction models. The findings suggest that better pavement conditions can reduce the severity of fatal and injury collisions by as much as 12% in some cases and therefore that pavement maintenance decisions should incorporate road safety when assessing cost-life analysis. The results provide a basis for those decisions in that they can be used to estimate the safety effect of a specific improvement in roughness.

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“…However, the IRI thresholds used around the world vary widely [16]. This is mainly because the IRI limit value depends on the following aspects: road surface type (i.e., flexible or rigid road surface), road function category, average annual daily flow (AADT), legal speed limit, and the length of the road section considered in the IRI calculation [31]. In addition, their changes depend on new roads or the reconstruction of roads that are still in use.…”

Section: The Application Of International Roughness Indexmentioning

confidence: 99%

“…In addition, their changes depend on new roads or the reconstruction of roads that are still in use. Among the different parameters that affect the IRI specifications, the most important is undoubtedly the maximum allowable driving speed on the road, the roughness level of which should be evaluated [31]. In view of this, some researchers proposed speed-related IRI thresholds to evaluate the ride quality [32,33].…”

Section: The Application Of International Roughness Indexmentioning

confidence: 99%

Research on the International Roughness Index Threshold of Road Rehabilitation in Metropolitan Areas: A Case Study in Taipei City

et al. 2020

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The International Roughness Index (IRI) is the standard scale for evaluating road roughness in many countries in the world. The Taipei City government actively promotes a Road Smoothing Project and plans to complete the rehabilitation of the main and minor roads within its jurisdiction. This study aims to detect the road surface roughness in Taipei City and recommend appropriate IRI thresholds for road rehabilitation. A total of 171 asphalt concrete pavement sections in Taipei City with a total length of 803.49 km were analyzed and compared by IRI. The longitudinal profile of the detected road sections was measured using an inertial profiler. The statistical analysis showed that the IRI value prior to road leveling was mainly distributed between 5 and 8 m/km, while the IRI value after road leveling was mainly distributed between 3 and 4.5 m/km. This confirms that the implementation of the Road Smoothing Project has a significant effect on improving road smoothness. Moreover, based on the analysis results, it is recommended that the IRI threshold value for road rehabilitation in Taipei City be set at 4.50 m/km.

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Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

Cited by 39 publications

References 25 publications

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Assessing pavement conditions and their effect on road safety: Ontario experience

Research on the International Roughness Index Threshold of Road Rehabilitation in Metropolitan Areas: A Case Study in Taipei City

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