scholarly journals A Method for Traffic Calming Using Radio Transmitter

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Amin Mirza Boroujerdian ◽  
Samane Sheikhy
Keyword(s):  
Video Processing ◽  
Intelligent Transportation System ◽  
Transportation Safety ◽  
Speed Limit ◽  
Speed Reduction ◽  
Traffic Calming ◽  
Innovative Methods ◽  
Before And After ◽  
Voice Message ◽  
Major Factors

Excessive speed is one of the major factors in transportation safety assessment and is influenced by road geometric design, vehicle properties, and driving pattern. Exploiting innovative methods along with the conventional ones has been proven to be effective in road safety to control the speed limit. In this study, a supplementary tool is introduced to help drivers to observe the speed limit. In line with this objective, the effectiveness of Voice Sign System (VSS) as an Intelligent Transportation System is evaluated. In order to measure the speed, video processing software is used. Moreover, SPSS is utilized to perform statistical analysis and compare upstream and downstream speeds before and after a message transmission. The study is conducted in Yadegar-e-Imam expressway, located in Tehran, to evaluate the effectiveness of a voice message. The message reads as follows: “Observe the Speed Limit.” The results reveal that VSS is an effective tool for speed reduction as well as the speed limit observation in expressways. The study shows that the speed is reduced by 18% on average, and speed limit observation is improved by 46.5%, out of which 18.2% is direct and 28.3% is indirect influence of VSS.

Methods to Reduce Traffic Speed in High-Pedestrian Rural Areas

2003 ◽  
Vol 1828 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Ali Kamyab ◽  
Steve Andrle ◽  
Dennis Kroeger ◽  
David S. Heyer
Keyword(s):  
Rural Areas ◽  
Speed Limit ◽  
Single Word ◽  
Short Term ◽  
Speed Reduction ◽  
Traffic Calming ◽  
Reduction Strategies ◽  
Long Term Impact ◽  
The Impact

Many Minnesota counties are faced with the problem of high vehicle speeds through towns or resort areas that have significant pedestrian traffic. The impact of speed reduction strategies in high-pedestrian areas in rural counties of Minnesota was investigated. Speed data were collected at two selected study sites under their existing conditions ("no-treatment" or "before" condition) and after the proposed speed reduction strategies were installed. Second "after" data conditions were collected to study the short-term and long-term impact of the implemented strategies. The traffic-calming techniques employed at the Twin Lakes site consisted of removable pedestrian islands and pedestrian crossing signs. A dynamic variable message sign that sent a single-word message ("Slow") to motorists traveling over the speed limit was installed at the Bemidji site. The research study shows that the traffic-calming strategy deployed in Twin Lakes was effective in significantly reducing the mean speed and improving speed limit compliance in both the short term and long term. Despite proven effectiveness, the deployed speed reduction treatment in Bemidji Lake failed to lower the speed at the study site. The single-word message on the sign and the location of the sign, as well as a lack of initial enforcement, were the primary reasons for such failure.

scholarly journals Identification of Determinants of the Speed-Reducing Effect of Pedestrian Refuges in Villages Located on a Chosen Regional Road

Symmetry ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 597
Author(s):  
Alicja Sołowczuk ◽  
Dominik Kacprzak
Keyword(s):  
Traffic Engineering ◽  
Geometric Parameters ◽  
Speed Reduction ◽  
The Road ◽  
Traffic Calming ◽  
Engineering Discipline ◽  
Number Of Factors ◽  
Before And After ◽  
Layout Geometry ◽  
Specific Factors

Traffic calming, as a traffic engineering discipline, is becoming an increasingly important aspect of the road engineering process. One of the traffic calming treatments are pedestrian refuges—raised islands located on or at the road centreline. This paper presents factors relevant to the performance of this kind of traffic calming devices retrofitted on the stretches of regional roads in village areas. To this end, speed surveys were carried out before and after the islands in each direction on purposefully chosen test sections. In order to identify the determinants, each test section was characterised by features including the symmetry of the road layout geometry, surrounding features and the existing traffic signs and, last but not least, visibility of the road ahead. The survey data were used by the authors to perform analyses in order to group the speeds at the pedestrian refuges and relate them to specific factors and, finally, identify the determinants of speed reduction. In this way, the authors arrived at a conclusion that the performance of pedestrian refuges depends on a number of factors rather than solely on their geometric parameters. The analyses showed that the pedestrian refuge geometric parameters, features located in its proximity that influence the driver’s perception and placement of appropriate marking, can, in combination, result in achieving the desired speed reduction and ensure safety of non-motorised users. These hypotheses were tested on a stretch of a regional road in village area at three points of the process: before upgrading, after installation of pedestrian refuges, and after retrofitting of enhancements.

scholarly journals Identification of the Determinants of the Effectiveness of On-Road Chicanes in Transition Zones to Villages Subject to a 70 km/h Speed Limit

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5244
Author(s):  
Alicja Sołowczuk ◽  
Dominik Kacprzak
Keyword(s):  
Traffic Safety ◽  
Traffic Management ◽  
Design Parameters ◽  
Additional Energy ◽  
Speed Reduction ◽  
Transition Zones ◽  
Road Design ◽  
Traffic Calming ◽  
Before And After ◽  
Surrounding Landscape

In recent decades traffic calming, especially in villages situated on through roads, has become an urgent issue. Various schemes are applied in the transition zones to reduce the inbound traffic speeds and thus improve the traffic safety. The studies conducted in several countries point to different determinants of the speed reduction obtained in this way. This article deals with the schemes including a central island horizontally deflecting one lane, located in transition zones to villages with 70 km/h speed restriction on two-lane roads (6 m carriageway width). In order to identify the speed reduction determinants, the speeds before and after chicanes were measured and the effect of the three criteria was investigated, characterising: the traffic management scheme, road design parameters, landscape elements present in the surroundings of the transition zone and visibility conditions. Based on the confirmation of logical tautology of many pre-selected factors, one aggregate parameter was proposed for the assessment of the practicable level of speed reduction, combining the effect of the selected factors in the above-mentioned criteria. Statistical analysis of the obtained results confirmed a statistically significant relationship between both the speed reduction value and the speed reduction index, and the aggregate parameter proposed by the authors. Factors related to the surrounding landscape and visibility conditions were found to have the greatest direct effect on speed reduction. The chicanes chosen in the final step of the proposed design process should be enhanced by additional solar-powered elements ensuring their improved visibility. These devices should not, however, require any additional energy supply and should not increase the construction or maintenance costs.

scholarly journals Identification of the Determinants of the Effectiveness of On-Road Chicanes in the Village Transition Zones Subject to a 50 km/h Speed Limit

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4002
Author(s):  
Alicja Barbara Sołowczuk ◽  
Dominik Kacprzak
Keyword(s):  
Traffic Management ◽  
Road Traffic ◽  
Speed Reduction ◽  
Factors Affecting ◽  
Transition Zones ◽  
The Road ◽  
Traffic Calming ◽  
Before And After ◽  
Traffic Volumes ◽  
The Village

In recent years, in which a considerable increase in the road traffic volumes has been witnessed, traffic calming has become one the key issues in the area of road engineering. This concerns, in particular, trunk roads passing through small villages with a population of up to 500 and the road section length within the village limits of ca. 1400–1700 m. A successful traffic calming scheme must involve primarily effective reduction in inbound traffic speed. A review of the data from various countries revealed that chicanes installed in the transition zones may have a determining effect on the success of the traffic calming project. The effectiveness of such chicanes depends mainly on the type of chicane, its location on the carriageway, its shape and the size of the lateral deflection imposed by the chicane on the inbound lane. The purpose of this study was to identify the speed reduction determinants in traffic calming schemes in village transition zones, based on a central island horizontally deflecting one lane of a two-lane two-way road with 50 km/h speed restriction. As part of the study, vehicle speeds were measured just before and after the chicanes under analysis. Furthermore, the inbound lane traffic volumes were measured in field and a number of factors were identified, including the applied traffic management scheme, road parameters, view of the road ahead and of the village skyline, isolated buildings, road infrastructure and adjacent roadside developments. The obtained data were analysed with a method employing tautologies of the selected 32 factors affecting the drivers’ perception. A single aggregate parameter was proposed for assessing the coincidence of the influence of selected factors on speed reduction. The analysis of the existing schemes and the results of statistical analyses carried out in this study confirmed the authors’ hypothesis that the combined selected factors produce a desirable effect and that they should be additionally enhanced by the application of solar powered devices.

scholarly journals The effectiveness of new 3D visual effect speed hump in speed reduction

2018 ◽  
Vol 250 ◽  
pp. 02001
Author(s):  
Kamarudin Ambak ◽  
Suhailah Jemari ◽  
Basil David Daniel ◽  
Mohd Hanifi Othman ◽  
Muhamad Nazri Borhan
Keyword(s):  
Hypothesis Test ◽  
Speed Limit ◽  
Vehicle Speed ◽  
Chi Square ◽  
Visual Effect ◽  
Speed Reduction ◽  
Housing Area ◽  
Before And After ◽  
Chi Square Test ◽  
Chi Square Analysis

Intersection is a function of parsing and altering traffic movement. The safety of vehicle manoeuvres at the junction depends on the minimum speed. The purpose of this study is to identify the effectiveness of the usage of temporary speed hump (3D visual effect) to reduce vehicles speed approaching a Priority Junction. This study was conducted at three (3) different residential locations namely Taman Murni, Kampung Merdeka and Taman Bahagia Koperasi in Batu Pahat area. These intersections were chosen because it connects one housing area to another and acts as a short-pass to a destination. Based on the observational activity, there were some traffic conflicting and potential for accidents at the intersection as well. The speed data were collected using laser guns and filled into special forms including date, location, weather, start and end time of observation and also the category of vehicles passed through the intersection. A hypothesis test was conduct to analyze the vehicle speed data before and after installation of the temporary a new 3D visual effect of speed hump. The results were analyzed using the Chi-Square test in Statistical Package for Science Social (SPSS) software. The Chi-Square analysis demonstrates that the effectiveness of using temporary a new 3D visual effect of speed hump is significant statistically (p<0.05, χ2== 291.575). Majority vehicles (74%) were complied with speed limit when approaching intersection compared to 26% of vehicles who do not to do so. In addition, there was decline in the number of uninterrupted vehicles can be seen after parking traffic. Therefore, the study confirmed that drivers who speeding over the speed limit zones before approaching the intersection might be intervened after the installation of the new 3D visual effect of speed hump.

scholarly journals Multithreading Application for Counting Vehicle by Using Background Subtraction Method

2020 ◽  
Vol 14 (3) ◽  
pp. 309
Author(s):  
Yohanssen Pratama ◽  
Puspoko Ponco Ratno
Keyword(s):  
Data Acquisition ◽  
Real Time ◽  
Video Processing ◽  
Intelligent Transportation System ◽  
Road Traffic ◽  
Ccd Camera ◽  
Acquisition Time ◽  
Application Performance ◽  
Typical Application ◽  
Before And After

Image and video processing has become important part in intelligent transportation system (ITS) application, especially for collecting road traffic data. Pictures that already collected by a charged coupled device (CCD) camera usually being processed by several image processing algorithms and the application’s code will be executed in a large number of iteration because many algorithms are getting involved in processing the frame which captured by the camera. Typical application will process the first frame until finish and then continue to the next frame, so the application must wait until the first frame being processed. If the algorithms that executed quite complex and have a significant running time there will be a dropped frame and the time difference between data acquisition and real time video is divided by large margin. We proposed an implementation of multithreading to boost the application performance so the data can be acquire in real time and every new frame could be processed in short time. The application performance before and after using a multithreading is known by comparing the data acquisition time that stored in the database. The application effectiveness could define by running a multiple video streaming in same resolution.

scholarly journals Effect of Lane Narrowing Implemented on an Urban Dual Carriageway on Speed Reduction and Acoustic Environment

Buildings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 31
Author(s):  
Alicja Barbara Sołowczuk ◽  
Dominik Kacprzak
Keyword(s):  
Traffic Safety ◽  
Traffic Noise ◽  
Motor Vehicles ◽  
Surrounding Area ◽  
Acoustic Environment ◽  
Speed Reduction ◽  
Traffic Calming ◽  
Local Topography ◽  
Before And After ◽  
Surrounding Landscape

The on-going growth in the use of motor vehicles leads to a number of traffic safety problems. Therefore, various traffic calming measures are applied to increase traffic safety in built-up areas. Lane narrowing is one of the techniques used to influence the perception of drivers and make them slow down. With this in mind, the authors conducted traffic volume and speed counts before and after installation of the lane narrowing treatment, covering 100 passing vehicles, at an intersection between an urban dual carriageway and an estate street where over a dozen fatal accidents occurred in the recent years. Traffic noise was also measured, both before and after lane narrowing. The traffic count data were analysed to show speed reduction by ca. 15 km/h, yet in all cases still above 50 km/h, which is the speed limit applicable to built-up areas in Poland. The analysis of the “before” and “after” noise maps showed only minor changes to the distribution of noise. The locations of these changes to the acoustic environment depended on the speed and volume of traffic and, much more importantly, on the topography of the surrounding area, the existing roadside layered landscape and the type of planted vegetation. The detailed analyses of the analysed parameters demonstrated that sustainable design of traffic calming measures on urban dual carriageways must consider not only the desired speed reduction but also the surrounding landscape and the local topography.

scholarly journals Application and practice of a step-by-step method combined with case-based learning in Chinese otoendoscopy education

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Fanqin Wei ◽  
Qiyang Sun ◽  
Zili Qin ◽  
Huiwen Zhuang ◽  
Guangli Jiang ◽  
...  
Keyword(s):  
Learning Experience ◽  
Step Method ◽  
Innovative Methods ◽  
Before And After ◽  
Case Based Learning ◽  
Group A ◽  
Clinical Thinking ◽  
Group B ◽  
Learning Interest ◽  
Case Based

Abstract Background Standardized training allows more physicians to master otoendoscopic surgery. However, the lecture-based learning (LBL) applied in otoendoscopy teaching may not be conducive to training students in clinical thinking and surgical ability. It is necessary to explore innovative methods for otoendoscopy teaching. This study aimed to determine the effect of a step-by-step (SBS) method combined with case-based learning (CBL) in otoendoscopy teaching. Methods Fifty-nine physicians who participated in otoendoscopy training were selected as the study subjects and randomly divided into two groups (A and B). Group A underwent training with the SBS & CBL method, while Group B underwent training with the LBL & CBL method. The effects of these two methods for otoendoscopy training were compared by evaluation of professional skills and questionnaires before and after the training. Results Proficiency in otoendoscopic anatomy and grades for both professional knowledge and otoendoscopic skills were significantly higher in Group A than in Group B(P < 0.05). In terms of learning interest, surgical ability, acting capacity during surgery, reducing surgical complications, and satisfaction with learning experience, all responses from Group A were better than those from Group B(P < 0.05). Conclusions The SBS & CBL method may help to improve ability in otoendoscopic surgery and clinical thinking and appears suitable for endoscopy teaching.

Abstract 683: Regression of Plaque Volume in One Arterial Bed is not Necessarily Associated with Similar Changes in Other Vessels

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Takayuki Suzuki ◽  
Takashi Nozawa ◽  
Mitsuo Sobajima ◽  
Takashi Ohori ◽  
Akira Matsuki ◽  
...  
Keyword(s):  
Population Based ◽  
Plaque Volume ◽  
Independent Variables ◽  
Before And After ◽  
Independent Variable ◽  
Artery Disease ◽  
Soft Plaque ◽  
Major Factors ◽  
Atherosclerotic Changes

Background: Population-based studies have shown good correlation between severity of atherosclerotic disease in one arterial bed and involvement of other vessels. However, in patients with coronary artery disease (CAD), it remains unclear whether atherosclerotic plaque in an artery might regress or progress in parallel with other vessels. Accordingly, the present study was performed in patients with CAD to compare changes in plaque volume (PV) between the left main (LMT) and right coronary arteries (RCA), thoracic descending aorta (TDA) and common carotid artery (CCA), and to clarify clinical factors and biomarkers which might affect changes in PV in each artery. Methods: Using 64-multislice computed tomography, PVs in each artery were determined before and after 2.0-year follow-up period in 52 patients with CAD (67.4±9.9yo). Based on our previous study using ultrasound, CCA-PV was determined at windows of 90–240HU and TDA-PV determined manually. Coronary soft plaque was determined at windows of 0–75HU. Plasma levels of hsCRP, matrix metalloproteinase (MMP)-9 and urinary 8-iso-prostaglandin F2 α (PGF) were determined at baseline. Results: At baseline, PVs of TDA were correlated with CCA-PV (r=0.38, p<0.02), but PVs of other arteries did not correlate to each other. Two-year later, PVs of LMT, RCA, TDA, and CCA were reduced in 41, 62, 27, and 39% of patients, respectively. Changes in LMT-PV were weakly related with those of TDA-PV (r=0.37, p=0.02) and RCA-PV (r=0.31, p=0.08), but there were no relation between other arteries. The multivariate analysis revealed that treatment with statin and low LDL-cholesterol (C, <100mg/dl) were independent variables regarding a reduction in DTA-PV, but, in LMT, only low LDL-C was independent variable. However, there were no independent variables in RCA or CCA. The ratio of soft PV to total PV was similar between LMT (45.2±7.1%) and RCA (45.7±4.9%) at baseline and was unchanged in the follow-up study. None of hsCRP, MMP-9 or PGF levels was related with PVs of any arteries at baseline and with changes in PVs. Conclusions: Regression of PV in one arterial bed dose not necessarily allow us to predict atherosclerotic changes in the other vessels. Major factors which affect changes in PV may not be homogeneous between arteries.

Evaluation of Bacterial Contamination on Prehospital Ambulances Before and After Disinfection

2018 ◽  
Vol 33 (6) ◽  
pp. 602-606
Author(s):  
Roohollah Farhadloo ◽  
Jalil Goodarzi Far ◽  
Mohammad Reza Azadeh ◽  
Saeed Shams ◽  
Mohammad Parvaresh-Masoud
Keyword(s):  
Nosocomial Infections ◽  
Bacterial Contamination ◽  
Microbial Contamination ◽  
Contamination Level ◽  
Publication Type ◽  
Bacterial Agent ◽  
Before And After ◽  
Quasi Experimental ◽  
Effective Role ◽  
Major Factors

AbstractBackgroundThe contamination of the environment, ambulance equipment, and staff hands consequently are major factors which create nosocomial infections in emergency patients. The contamination of equipment and devices plays an important role in nosocomial infections.ObjectivesThe aim of this study was to determine the effectiveness of a disinfectant on the rate of microbial contamination of ambulances in Qom Emergency Medical Services (EMS), Qom, Iran.MethodsThis is a quasi-experimental study with a before-after design in order to determine microbial contaminations at the rear and front cabin of ambulances, as well as medical equipment being utilized in Qom EMS. Saya sept-HP-2% solution was used for disinfection. Bacteriological standard methods were used to identify the contaminations.ResultsThe contamination rates before and after use of disinfection solution were 52% and eight percent, respectively. Coagulase-negative staphylococci were the most commonly isolated bacterial agent from the equipment (53%). In all equipment, the contamination level has shown a significant reduction after applying disinfectant.Conclusions:In spite of the fact that the rate of infection from ambulance equipment is high, the results showed that the use of the suitable disinfectant had an effective role in the reduction of bacteria.FarhadlooR, Goodarzi FarJ, AzadehMR, ShamsS, Parvaresh-MasoudM.Evaluation of bacterial contamination on prehospital ambulances before and after disinfection. Prehosp Disaster Med. 2018;33(6):602–606.

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