The effect of speed bumps and humps on the concentrations of CO, NO and NO2 in ambient air

Januševičius, Tomas; Grubliauskas, Raimondas

doi:10.1007/s11869-019-00683-y

Cited by 12 publications

(12 citation statements)

References 23 publications

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“…Layout parameters include spacing between speed hump, construction materials, marking, and signage. Many researchers have studied the potential positive and negative effects of calming devices, especially speed humps [1][2][3][4][5][6][7]. It is worth mentioning that very little work has been done to study the impact speed humps on the pavement condition [8].…”

Section: Literature Reviewmentioning

confidence: 99%

Impact of Road Humps on the Pavement Surface Condition

2019

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In order to fight against over-speeding, the government and people in Egypt resorted to the installation of speed humps without adequate studies. On this basis, speed humps became widespread in most of the Egyptian roads in a semi-random way. It has been observed that the pavement condition of the roads has deteriorated in the vicinity of these humps. For impact assessment of speed humps on the pavement condition index (PCI), three roads link Kafr El-Sheikh city with three major towns in Kafr El-Sheikh governorate were selected to conduct PCI survey. The results indicated that the presence of speed humps contributes greatly to reduce the pavement condition index (PCI) values. It should be mentioned that the average reduction in PCI values ranged between 15% and 22% due to the presence of speed humps. Also, the most frequently observed distress on the pavement sections including humps considered for the selected roads was Raveling and Rutting. Accordingly, to avoid the pavement defects at the locations where the speed humps are installed, it is proposed to study the structural section of the road in the vicinity of the speed hump to resist the braking force and speed reduction effect.

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Section: Literature Reviewmentioning

confidence: 99%

Impact of Road Humps on the Pavement Surface Condition

2019

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“…Conversely, drivers decelerate to avoid collisions with other vehicles, to stop at traffic lights, to reduce their speed at speed limit areas, and to negotiate speed bumps and pedestrian crossings. Unfortunately, these changes in speeds due to acceleration and deceleration, are the main sources of vehicles emissions [8,9,[17][18][19]26]. Also, in congested traffic, higher emissions are produced at low speeds [1,2,27,28].…”

Section: Traffic-calming and Emissionsmentioning

confidence: 99%

“…Many studies have investigated the generation of pollutants from traffic. Some of them monitor pollutants levels at different control sites on roads [9,18,19,29] and others use specialized equipment mounted on cars to collect information about the traffic flow or the pollutants levels [1,2,20,23]. The data collected from the monitoring of traffic flow, origin and destination of journeys, elapsed monitoring time, length of the roads, traffic composition and weather are feed into traffic simulators to generate acceleration profiles of vehicles that are used by emission estimation software to compute traffic emissions [30][31][32].…”

Section: Traffic-calming and Emissionsmentioning

confidence: 99%

“…The previously mentioned air pollutants, CO 2 , NO x ), VOC and PM are primarily generated by changing speed and due to the wear of tires by braking [8,9,[17][18][19]. Changing the speed of a vehicle is a common action of every driver during a journey.…”

Section: Introductionmentioning

confidence: 99%

“…Although their effect on traffic flow and pedestrian safety has been widely studied [21][22][23][24][25], there are few studies on their effect on air quality and pollutants generation. Some works monitor pollutants using specialized equipment mounted on cars or installed at control sites [1,2,9,[18][19][20]23]. Some others recommend to increase the number of traffic-calming measures and reduce the distance between them to improve safety on pedestrians [22,25].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Speed Humps on Instantaneous Traffic Emissions

et al. 2020

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Bad air quality due to free pollutants such as particulate matter (PM), carbon dioxide (CO 2 ), nitrogen oxides (NO x ) and volatile organic components (VOC) increases the risk of long- term health diseases. The impact of traffic-calming measures on air quality has been studied using specialized equipment at control sites or mounted on cars to monitor pollutants levels. However, this approach suffers from a large number of variables on the experiments such as vehicles types, number of monitored vehicles, driver’s behavior, traffic density, time of the day, elapsed monitoring time, road conditions and weather. In this work, we use a cellular automata and an instantaneous traffic emissions model to capture the effect of speed humps on traffic flow and on the generation of CO 2 , NO x , VOC and PM pollutants. This approach allows us to study and characterize the effect of many speed humps on a single lane. We found that speed humps significantly promote the generation of pollutants when the number of vehicles on a lane is low. Our results may provide insight into urban planning strategies to reduce the generation of traffic emissions and lower the risk of long-term health diseases.

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