Tuesday, January 28, 2020

Increasing Pedestrian Safety

Increasing Pedestrian Safety 2.0 Literature Review 2.1 Introduction Intersection is the most critical place for pedestrian as they come directly into contact with the ongoing traffic. Both signalized and un-signalized intersection pose a safety concern and different measures have been taken to safely and effectively accommodate pedestrian and traffic in the intersections. To accommodate pedestrians, two common types of pedestrian phasing have been used at signalized intersections -concurrent phasing and exclusive phasing (or scramble phasing). Concurrent pedestrian phasing is the most common and used all over the world, but there are so many places where exclusive pedestrian phasing has also been used. A concurrent phasing allows pedestrian to cross parallelly with the motor vehicle traffic on any approach having green indication. Both pedestrians and vehicles share the same green phase of traffic signal which allows longer flow of traffic and pedestrians. The interaction of traffic come with the pedestrian due to right turning and left turning movements across the pedestrian crosswalk. There may be another interaction from the vehicles of right turns on red from the approach perpendicular to the crosswalk. Alternatively, an exclusive pedestrian phase is only for pedestrian crossing which stops all the vehicular movement and pedestrian can cross any direction including diagonally. This increases the overall cycle length of the signal, but ensures no interaction of pedestrian with the traffic. 2.2 Academic Research To address pedestrian safety huge amount of research has been done, but there is still much work to do and there is still scope to look from a different new perspective and analyze the safety measures. There are various factors responsible for pedestrian safety at an intersection and different studies have been done to analyze those factors and measure the importance. But, surprisingly, there have been relatively few studies performed comparing concurrent and exclusive pedestrian phase form the viewpoint of the safety benefits, number of illegal crossings, crash number and change in LOS of the intersections. After the implementation of an exclusive pedestrian phase, it is very essential to understand how users are accepting this. Any facility can be a failure if the people cannot use the way it should be used. Positive and accepting perspective is crucial for the success of an exclusive pedestrian phase as non-compliance will lead to illegal crossing which will undue the ultimate goal of exclusive pedestrian signal. McKernan et al. (2016) investigated pedestrian compliance of concurrent and exclusive pedestrian crossing at 42 signalized intersections to find whether there are differences between pedestrian compliance with exclusive pedestrian phasing and concurrent pedestrian phasing. They used binary regression model to estimate pedestrian compliance and they considered pedestrian phasing type, intersection characteristics such as vehicular and pedestrian volume, crossing distance and speed limit. They found significantly higher pedestrian compliance with concurrent pedestrian phasing t hen exclusive pedestrian phasing. But the difference was not significant when they considered exclusive pedestrian phase intersections as if it had concurrent phasing and they concluded that pedestrian treat exclusive pedestrian phase as a concurrent pedestrian phase. (McKernan, 2016). Few other researchers observed and collected data regarding pedestrian compliance with exclusive pedestrian phase. According to Lina Kattan, public showed a positive attitude toward exclusive pedestrian phase and they understood the change in the way the intersection used to work and accepted it. (Lina Kattan 2009). To get the benefits of an exclusive pedestrian phasing, it is necessary to understand pedestrian crossing behavior in such an unconventional facility. Few studies investigated the changes in pedestrian crossing behavior following the implementation of an exclusive pedestrian phase. Hediyeh et al. (2015) investigate the changed behavior using spatiotemporal gait parameters (step length and step frequency). They found both average step length and walking speed were significantly higher for diagonally crossing pedestrians compared with pedestrians crossing on the conventional crosswalks. They found pedestrians to have the tendency to increase their step length more than their step frequency to increase walking speed. They also found that, compared with men, women generally increase their walking speed by increasing their step frequency more than step length. However, when in non-compliance with signal indications, women increase their walking speed by increasing their step length more t han step frequency. (H. Hediyeh, 2015). Medina et al. also emphasized on better understanding of pedestrian behavior at locations with exclusive pedestrian phases. To do that they collected field data from a college campus at busy intersection and analyzed the individual and group crossing data. From the analysis, they found 15th percentile speeds for the diagonal and the parallel crossings were respectively 4.37ft/s and 4.49 ft./s which are higher than the 3.5 ft./s as recommended by the MUTCD. They also found, 15th percentile speeds of pedestrians traveling individually and those in free flow were significantly higher than those traveling in groups and in non-free-flowing conditions. In addition, they observed fewer pedestrian to cross diagonally than parallelly. (J. C. Medina, 2014). Hediyeh et al. (2014) has also investigated changes in pedestrian speed behavior following the implementation of an exclusive pedestrian phase. They studied pedestrian speed variations with respect t o design changes to intersection crossings. The results showed that the average crossing speed is higher after the implementation of the exclusive pedestrian phase. They found higher average crossing speed for diagonal crossing than side crosswalk crossing. They also observed pedestrians to have higher speed through the first half of the crosswalk. (Houman Hediyeh, 2014) Marsh et al. conducted a survey and an analysis of existing pedestrian and vehicle movements to find the change in patterns that would result from the inclusion of an exclusive pedestrian phase in the existing signalized intersections. He considered convenience, comfort and safety as three main requirements for pedestrian crossing and the improvement of these criteria due to the change of crossing facility. The investigation showed that the three criteria are not enhanced by the change to exclusive pedestrian control. He also found vehicular traffic is to be disadvantaged with an increase in delays, stops and longer queues at traffic signals. Again, he found an increase in pedestrian delay by varying degrees, though it reduces the distance pedestrians must travel. Using a computerized simulation, he found that exclusive pedestrian phasing would have resulted in a 5% to 7% reduction in distance traveled by pedestrians at several intersections in New Zealand. (Marsh, 1982) The main purpose of implementing an exclusive pedestrian phase is to reduce the interaction of pedestrian with the traffic. Though it is designed to meet the purpose but the filed condition is not always favorable. Various reasons may be responsible for this including illegal pedestrian crossing, red light running etc. The interaction may not always lead to a safety hazard but definitely this is crucial for the success of exclusive pedestrian phase. Zhanga et al. (2015) compared exclusive and concurrent pedestrian phasing from the perspective of severity of interaction with motor vehicles where they observed and classified pedestrian crossing and severity of interaction. From their research, they found that, pedestrian experience lower interaction severity with motor vehicles with exclusive pedestrian phase compared to crossing on the green light with concurrent pedestrian phase. They also found lower crash number in case of exclusive pedestrian phase but crash severity was high than crashes of concurrent pedestrian phase. (Yaohua Zhanga, 2015) Reducing interaction is supposed to lead in reduction of pedestrian crash number. As pedestrian phase is implemented only to accommodate pedestrian safely it was thought to reduce pedestrian crash number significantly. Different study shows different results regarding the reduction of crash frequency. Zegeer et al. (1982) studied 1296 traffic signalized intersection to determine significance of pedestrian signal indications and signal timing strategies to pedestrian accidents. From their analysis using different statistical tests, they found no significant difference in pedestrian accidents between intersections that had concurrent walk pedestrian signals compared with intersections that had no pedestrian signal indications. For exclusive pedestrian crossing, they found lower number of pedestrian crashes with moderate to high pedestrian volume. (Charles V. Zegeer, 1982). Again, Garder et al. (1989) tested the safety benefit of exclusive pedestrian crossing at three sites and found to be beneficial in small town but not in city. He found that exclusive pedestrian signal may not be effective in city due to high number of red walker in the city traffic signal intersection. He suggested that shorter waiting time will decreases the number of red walking. (Garder, 1989). As the sample size was not very large, detailed study is required to say where exclusive pedestrian phase is beneficial, in the city or in the small town. Zaidel et al. (1987) also tested the relationship between pedestrian crossing types and average number of accidents including both pedestrian and vehicle accidents. From their analyzed 5-year data from 320 signalized intersections they concluded that, pedestrian crossing type has no effect on vehicular accident and very less effect on pedestrian accident. They identified vehicle volume, pedestrian activity, and intersection complexity as the reasons behind pedestrian and vehicular accidents. But they indicated that, exclusive and concurrent pedestr ian phases may provide different degrees of pedestrian protection for different combination of vehicle and pedestrian volume. (D. M. Zaidel, 1987). Fleig and Duffy found no significant reduction in the proportion of unsafe acts or pedestrian accidents after the installation of exclusive pedestrian signals at 11 locations. Their accident data were limited to 27 accidents in the before period and 25 accidents in the after period, with each of these periods only one year in duration. The authors of the study concluded that pedestrian signals are not effective in reducing pedestrian accidents (P. Fleig, 1967). But the limited data used raise questions about the statistical validity of this conclusion. Chen et al. evaluated relative effectiveness of four signal related pedestrian countermeasures in New York City and found exclusive pedestrian phase as the second most effective countermeasure to reduce pedestrian crashes but they described it to insignificantly increase vehicle crashes. ( Li Chen, 2012). The few published evaluations of scramble signals have generally found that in cases in which vehicle volumes are high, scramble phasing has reduced crashes and traffic conflicts. Moreover, in cases with high pedestrian volume conflicting with turning vehicles, scramble phasing has been shown to be especially effective. Abrams et al. conducted a research to compare safety of pedestrians and delay of both pedestrian and vehicles for four different types of phasing facility of an intersection. The results of the study indicated that the combined pedestrian-vehicle interval will almost always minimize overall pedestrian and vehicle delay. The only exception occurs for the case in which a pedestrian-vehicle conflict causes long queues of vehicles to form in a right-turning lane (or left-turning lane on a one-way street). They suggested that, exclusive pedestrian phasing is capable of increasing pedestrian safety by completely separating pedestrian and vehicular movements; however, this benefit is canceled if pedestrian compliance is low. They emphasized that, if violations are frequent, the use of exclusive pedestrian phasing may be a safety hazard. (C. M. Abrams, 1977) Very few researchers tried to model exclusive pedestrian phase and evaluate the delay. Nash et al. carried out a modelling work to assess the efficiency of exclusive pedestrian phases at traffic signals. They examined one cross intersection and one T-intersection in the Melbourne CBD and used SIDRA software package to model the existing two-phase operation and the three-phase exclusive pedestrian crossing arrangement. They found a slight increase in pedestrian delay and significant increase in vehicular delay. (D. Nash, 2010) The main reason behind insignificant reduction of pedestrian crash number is number of illegal crossing. Since, traffic is stopped on all directions, exclusive pedestrian phasing results in longer delays for motor vehicles and pedestrians. The illegal crossing is intrigued by this long waiting time which can make pedestrian frustrated. In such case, pedestrians often do not wait for the pedestrian phase, potentially resulting in unexpected interactions between pedestrians and motor vehicles. The requested pedestrian phase may then go unused, but the drives have to wait for the phase to run its course. It also impacts them negatively and red light running may increase. Pedestrian phase is an additional phase. Few studies showed that crash frequency in a signalized intersection may change due to increase of the number of signal phases. Agbelie et al. investigated crash data of seven years from 381 intersections and concluded that, a unit increase in the number of signal phases would in crease crash frequency by 0.4. (Bismark R. D. K. Agbelie, 2014) Some researcher has got opportunity to conduct study right after the implantation of an exclusive pedestrian signal like Kattan et al. (2009), who conducted a study to evaluate the pedestrian safety of an exclusive pedestrian phase at an intersection of Canada. They collected pedestrian conflicts on that intersection for six weeks and developed poison regression model to model the number of conflicts and violations. Their findings showed decreased pedestrian-vehicle conflicts but increased pedestrian signal violations. They found 13% of the violation was safe as it was concurrent with the vehicle movement and 2% crossings were unsafe. (Lina Kattan, 2009). They continued the study to determine the longer-term effect of this operation on pedestrian safety. To do that, they collected data again one year after the implementation of exclusive pedestrian signal and developed four poison regression model to model the number of conflicts and violations. They found some changes in the results from the previous study conducted at the same location. Their results showed that the number of pedestrian-vehicle conflicts and pedestrian violations decreased significantly on weekdays but both pedestrian violations and conflicts increased significantly on weekends after implementation of the scramble operation. (Manoj Shah, 2010). Bechtel et al. (2004) conducted a similar study in the city of Oakland, California to determine the safety impacts of an exclusive pedestrian signal. They found statistically significant decrease in the number of conflicts between pedestrian and vehicle but significant increase in the number of illegal crossing. They concluded that exclusive pedestrian phase improved pedestrian safety despite the increased number of illegal crossing as those illegal crossings are concurrent to traffic flow which makes the crossing somehow safe. (Allyson K. Bechtel K. E., 2003). Several other researchers tried to measure the pedestrian- vehicle conflict level for exclus ive pedestrian signal. Yang et al. (2005) found that exclusive pedestrian phases are effective measures to reduce conflicts between pedestrians and motor vehicles at signalized intersections. (X. Yang, 2005). The main issue with implementing exclusive pedestrian phase is not having specific guidelines. For traffic signal or number of phasing there are developed guidelines to follow. But no specific guidelines for implementing exclusive pedestrian phase was found in MUTCD or similar sources. Few researchers suggested few cases when to install an exclusive pedestrian phase. According to Li Chan, exclusive pedestrian phase should be installed at intersections with many pedestrians and a modest amount of traffic. But no range was developed to follow or work on. Again, in downtown area where pedestrian accumulation is rapid, an exclusive pedestrian phase may be beneficial. Compared crash data has not covered long range of time. Previous few studies compared crash data for one to three years before and after the implementation. More detailed analysis is needed to come to the conclusion if the pedestrian safety has been improved or not. Implementation of a type of pedestrian signal is also related to the characteristics of the location and the problem that the intersection is facing. For example, increasing cycle length may not be effective in a university area, but may be needed in an area with high number of elderly people. The above-mentioned studies focused on the compliance issue, before and after crash analysis to some extent, and safety benefit, none of the studied examined the change of LOS in the intersection for different types of pedestrian facility. Again, pedestrian vehicle interaction and conflict count may be used to predict crashes. References Allyson K. Bechtel, K. E. (2003). Oakland Chinatown Pedestrian Scramble: An Evaluation. Safe Transportation Research Education Center . Allyson K. Bechtel, K. E. (2004). Pedestrian Scramble Signal in Chinatown Neighborhood of Oakland, California. Transportation Research Record , 19-26. Bismark R. D. K. Agbelie, A. M. (2014). Impacts of Signal-Related Characteristics on Crash Frequency at Urban Signalized Intersections. Journal of Transportation Safety Security, 7, 199-207. doi:http://dx.doi.org/10.1080/19439962.2014.943867 C. M. Abrams, S. A. (1977). Selection of Pedestrian Signal Phasing. 56th Annual Meeting of the Transportation Research Board. Charles V. Zegeer, K. S. (1982). Effect of Pedestrian Signals and Signal Timing on Pedestrian Accidents. Transportation Research Board, 62-72. D. M. Zaidel, I. H. (1987). Safety of Pedestrian Crossings at Signalized Intersections. Transportation Research Record: Journal of the Transportation Research Board, 1141, 1-6. D. Nash, . W. (2010). The efficiency of scramble crossings. Transport Research International Documentation. Garder, P. (1989). Pedestrian Safety at Traffic Signals: A Study Carried Out with the Help of a Traffic Conflicts Technique. Accident Analysis Prevention, 21, 435-444. H. Hediyeh, T. S. (2015). The use of gait parameters to evaluate pedestrian behavior at scramble phase signalized intersections. Journal of Advanced Transportation, 49, 523-534. doi:doi: 10.1002/atr.1284. Houman Hediyeh, T. S. (2014). Automated Analysis of Pedestrian Crossing Speed Behavior at Scramble-phase Signalized Intersections Using Computer Vision Techniques. International Journal of Sustainable Transportation, 8(5), 382-397. doi:10.1080/15568318.2012.708098 J. C. Medina, E. G. (2014). Analyzing Pedestrian Behavior during Exclusive Pedestrian Phases for Improved Intersection Signal Timing. TDI Congress 2014: Planes, Trains, and Automobiles . Li Chen, C. C. (2012). The relative effectiveness of signal related pedestrian countermeasures at urban intersections-Lessons from a New York City case study. Transportation Research Record. Lina Kattan, S. A. (2009). Pedestrian Scramble Operations: Pilot Study in Calgary, Alberta, Canada. Transportation Research Record: Journal of the Transportation Research Board, 2140, 79-84. Manoj Shah, L. K. (2010). Follow-up Study on Pedestrian Scramble Operations in Calgary, Canada. Transportation Research Board. Marsh, D. R. (1982). Exclusive Pedestrian Control for Dunedins Cnetral Business District. Institution of Professional Engineers New Zealand, Transportation and Traffic Engineering Group Technical Session, 8. McKernan, K. R. (2016). A Study of Pedestrian Compliance with Traffic Signals Exclusive and Concurrent Phasing. Transportation Research Board Annual Meeting. P. Fleig, D. D. (1967). A Study of pedestrian Safety Behavior Using Activity Sampling. Traffic Safety,. X. Yang, W. M. (2005). Criterion of setting exclusive pedestrian phases at two-phase signalized intersections. Highway and Transportation Research and Development, 127-131. Yaohua Zhanga, S. A. (2015). Safety effects of exclusive and concurrent signal phasing for pedestrian crossing. Accident Analysis and Prevention, 26-36.

Monday, January 20, 2020

Sex vs. Solitude Essay -- The Woman in the Dunes, Onehundred Year

Solitude can exist in many ways and can be present in any form in human beings. Each person is eventually alone deep inside themselves, which is why communication and connections are essential in life. In the novel One Hundred Years of Solitude by Gabriel Garcia Marquez and Kobo Abe's The Woman in the Dunes, solitude is one of the main dilemmas that the main characters in the novels encounter. In the novels, the main characters are perpetually looking for a way to defeat their loneliness in the world and in many cases try to find it through sexual intercourse. The patriarch Jose Arcadio Buendia, in One Hundred Years of Solitude, is the founder of Macondo. The location of Mocondo is significant as it sits on an isolated place which gives the sense of the Buendia family being surrounded by solitude. It also seems as if solitude is an inherited trait of the Buendia family leading to a pattern of incest, which was started by Jose Arcadio Buendia and his wife, who is also his first cousin, Ursula Iguaran. Sex is probably used in the novel as a way to somehow bond the family together. Sex can be used as a tool to make connections to one another and can create body language which can also be a way of communicating. We see this especially in the second generation of the family, when Colonel Aureliano Buendia has sex during the wars with seventeen different women (which he shows no sign of predilection towards). You can also deduce that he went on a journey to free himself from solitude and overall was unsuccessful as it was shown when he m ade an attempt to get with the adolescent mulatto girl enslaved by her grandmother. This shows an effort by one of the Buendia men to try to have a loving relationship with another chara... ...There was no particular need to hurry about escaping." (239). Realizing his situation, he becomes one with the dunes and is able to live a purposeful life with the woman he once opposed living with. Without any type of sexual relationship, none of the characters in the novels One Hundred Years of Solitude by Gabriel Garcia Marquez and Kobo Abe's The Woman in the Dunes would have been explored thoroughly. Sex usually exposes a hidden hope or apprehension, desire and lust for something. In this case the characters of the novels lust, desire for identity and companionship, and is something they strive to acquire. In order to attain this, they attempt to use sex as a tool to triumph over solitude and gain communication and connection to reach one another. This is why sex is essential in providing two crucial things that are necessary in life to avoid solitude.

Sunday, January 12, 2020

Food Hygeine

4. 3 Describe basic food safety when providing food and drink to children and young people The Prevention of Food Poisoning Store food safely Keep food cold, the fridge should be kept as cold as possible without freezing the food ( 1-5 . c or 34-41. c) Freezers should be kept at -18 or below Cover or wrap food with food wrap of microwave cling film Never refreeze food Do not use food that is past the sell-by date Always read instructions on food packaging when storing food Once a tin is open store in a covered potStore raw foods at the bottom of the fridge in case of any dripping onto cooked food Always wash hands in warm soapy water and dry thoroughly before handling food Wear clean protective clothing when in the kitchen Keep food covered at all times Wash all fruit and vegetables before use Never cough or sneeze over food Always cover cuts with a blue plaster Keep work surfaces and chopping boards clean use different coloured chopping boards for raw meat raw fish fruit and vegetab les Make sure that meat is cooked through before serving Avoid raw eggs as you could get salmonellaWhen reheating food make sure it is hot all the way through the dish to kill any germs Keeping the Kitchen Safe Teach the children to wash their hands before eating or preparing food and after they have used the toilet Keep it clean to avoid flies and other insects in the kitchen Stay away from the kitchen if you have sickness or diarrhoea Keep the kitchen clean: Clean work surfaces, the floor, utensils, sink, cloths and rubbish bins Tea towels and wash cloths should be kept clean and washed regularly Keep all rubbish bins covered and empty them regularlyKeep sharp knives and scissors stored safely where the children cannot reach them Good Food Hygiene When serving, preparing and clearing away food after meals and snacks you should observe the rules of food hygiene. 1. Wash hands with warm soapy water and dry them thoroughly 2. Wear clean protective clothing 3. Ensure any washing up is done with hot water and washing up liquid and wear rubber gloves.If possible put the washing up in a dish washer. 4. Tea towels should be washed regularly and clean ones should be used daily. 5. Never cough or sneeze over food or drink Wearing Aprons Wearing aprons helps to protect clothing and to stop the spread of germs Hand Washing Chopping Boards Using different coloured chopping boards helps to prevent cross – infection when preparing food.

Friday, January 3, 2020

A Study Of Ethics And Morality Essay - 1474 Words

The study of ethics and morality is an extremely broad and general theme. It covers countless different areas of human life and our relationships with the decisions we make and their effects on all aspects of our own and others’ lives. According to the text of Thiroux and Krasemann, the topic of sexual morality is truly â€Å"the heart of morality† (260). The morality of human sexuality and marriage deeply covers the complex characteristics of human relationships and friendships, sexuality, love, intimacy, and a multitude of other moral engagements between humans. The main objective of this paper is to examine and clarify why, as humans, we should be concerned with the sexual morality of ourselves and others. While other major themes covered prior may not relate to all humans directly (such as abortion or the debate of taking a life), moral issues in sexuality are experienced by every member of humanity. In certain societies, the sexual behavior of a person is intensely dependent on the policies and rules of their religion. Even though religion serves as the mighty tradition holder of many cultures, it does not provide a fair explanation for how people should behave in terms of sexuality because of its ambiguity and lack of clarity. Sexual morality should be a concern to all human beings because we are all influenced by the purposes and public and private aspects of human sexuality, and we also all face conflicts in regards to various moral issues of sexuality. In addition, theShow MoreRelatedThe Relationship Between Religion and Ethics Essay972 Words   |  4 PagesTo answer this question, we must first understand what both ethics and morality are. As ethics is defined as the philosophical study of morality, those who study religion get their moral precepts from what they believe God says should be done. 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