Effect of Rainfall on Traffic Stream Characteristics during Peak and Non-Peak Periods

Alhassan, Hashim Mohammed; Ben-Edigbe, Johnnie

doi:10.18517/ijaseit.2.2.177

Cited by 5 publications

(4 citation statements)

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“…However, they concluded that the larger PCU values with higher standard deviations observed under dry conditions resulted from lacking sufficient sample size. In another research effort in Asia, Alhassan and Ben-Edigbe found that PCE values decreased with an increase in rainfall intensity in a highway section in Malaysia ( 11 ).…”

Section: Literature Reviewmentioning

confidence: 96%

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Investigating Combined Impact of Adverse Road-Weather Conditions and Heavy Vehicles on Saturation Headway

Hirose

Mehran

Pani

2022

Transportation Research Record: Journal of the Transportation R

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Adverse road-weather (RW) conditions make driving behavior more conservative and the headway during saturated conditions longer, leading to a significant reduction in the capacity of signalized intersections. Past studies indicate that the degree of the influence of adverse RW conditions on intersection performance changes by heavy vehicle (HV) ratio in traffic flow. However, little is known about the combined impacts of adverse RW conditions and HV ratio on saturation headway and how they can be considered in the planning of signalized intersections in areas with long winter. To fill this research gap, in this study the saturation headway data for over 2,000 signal cycles were extracted from video recordings at two signalized intersections in Winnipeg, Canada. The combined impacts of adverse RW conditions and HV ratios are statistically investigated in the paper with due focus given to saturation headway distributions and models. To account for differences in vehicle type, passenger car equivalent and headway distributions are evaluated under different RW conditions. The analysis findings suggest that the saturation headways increased by up to 38.7% as a result of adverse RW conditions. The multiple regression analyses incorporating HV ratios quantify the relationship between saturation headway and various sets of explanatory variables covering adverse RW conditions and roadway geometric factors. The model estimation results reveal that HVs are less sensitive to RW conditions than passenger vehicles. Overall, the study findings will help in designing signalized intersections under adverse RW conditions with various HV ratios.

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Section: Literature Reviewmentioning

confidence: 96%

“…In addition, the combined impact of RW conditions and traffic composition—that is, HV ratio—has not been studied adequately. Yet, there is concensus that HVs noticeably influence traffic parameters as a result of their larger vehicle size and limited maneouverability ( 4 , 11 ).…”

Section: Literature Reviewmentioning

confidence: 99%

Investigating Combined Impact of Adverse Road-Weather Conditions and Heavy Vehicles on Saturation Headway

Hirose

Mehran

Pani

2022

Transportation Research Record: Journal of the Transportation R

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“…Round-top since the working days in Johor are between Sunday and Thursday. During off-peak hours, there is more likely to be free traffic flow and, consequently, fewer interactions between vehicles [24].…”

Section: Sinusoidalmentioning

confidence: 99%

Evaluating the Effectiveness of Road Humps in Reducing Vehicle Speed: Case Study of a University Campus

Mashros

Nor

Kurnia

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Road humps are designed to control the speed of vehicles through the discomfort that drivers experience when crossing over them. Although the use of various types of road humps in low-speed environments is common, its effectiveness has yet to be seen. This paper evaluated the effectiveness of different types of road humps in reducing the speed of vehicles at a university campus. Field observations were carried out to determine geometric designs of five round-top and five flat-top road humps. All recorded design characteristics of road humps were compared with the standard specifications by various authorities. Only road humps that met any one or more of the standard specifications were considered for speed data collection. Speed data were observed at two selected points during off-peak weekdays and in daylight conditions. A comparison of the observed design characteristics of the road humps with the standard specifications by the authorities showed that most of the humps did not meet any design standard except one round-top road hump and two flat-top road humps. However, only one round-top and one flat-top road humps were considered for further analysis. The average speed of vehicles approaching the road humps was found to be higher than the average speed observed on road humps, with a reduction of 46% and 52% for round-top and flat-top road humps, respectively. The results of statistical analysis also showed that both types of road humps were effective in reducing the speed of vehicles. Thus, it can be concluded that road humps, irrespective of their type, have an impact on vehicle speed.

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“…Mukhlas et al (2016) [15] stated that increase in rainfall intensity leads to speed and capacity reduction. In a study carried out by Alhassan and Ben-Edigbe (2012) [16], capacity loss of 1.08%, 6.27% and 29.25% was reported for light, moderate and heavy rain, respectively. Capacity by its definition is stochastic, meaning it has no set value.…”

Section: Introductionmentioning

confidence: 99%

Effect of Night-time Rainfall on Traffic Stream Deterioration of Roads without Light

Makinde¹,

Ben-Edigbe²

2019

TOTJ

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Background: This paper fills an important gap in the on-going road lighting debate by investigating traffic stream deterioration during night-time rainfall. Introduction: The study carried out an investigation into the impact of night-time rainfall on traffic stream deterioration of two-lane roadways without lighting Methodology: In the rainfall impact studies, traffic volume, speed, vehicle type and headway data were collected at selected road segments in Akure, Nigeria. All surveyed roadways were within rain gauge catchment area of about 1km. Rainfall intensity was divided into three groups (light, moderate, and heavy). Dry weather data were used as a control parameter. Data Analysis: Stepwise data analysis is used for the ease of explanation and clarity. All model equations were tested for statistical fitness and deemed satisfactory for further analysis. Results: From the result, it is observed that rainfall intensityinfluences traffic flow at night-time. Conclusion: Based on the results and findings, it is correct to conclude that the effect of night-time rainfall on traffic stream deterioration of roadways without lighting is significant. It is also correct to assert that rainfall affect night-time traffic stream performance on roads without lighting.

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Effect of Rainfall on Traffic Stream Characteristics during Peak and Non-Peak Periods

Cited by 5 publications

References 0 publications

Investigating Combined Impact of Adverse Road-Weather Conditions and Heavy Vehicles on Saturation Headway

Investigating Combined Impact of Adverse Road-Weather Conditions and Heavy Vehicles on Saturation Headway

Evaluating the Effectiveness of Road Humps in Reducing Vehicle Speed: Case Study of a University Campus

Effect of Night-time Rainfall on Traffic Stream Deterioration of Roads without Light

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