Papers by Geophrey Mbatta
Journal of Transportation Engineering, Part A: Systems
Journal of Safety Studies
Traffic crashes are among the major cause of fatalities in most developing countries. A lack of a... more Traffic crashes are among the major cause of fatalities in most developing countries. A lack of a centralized historical crash database impedes the efforts to perform large-scale studies to understand the causes of crashes. However, the information for most major crashes are normally shared on social media. Therefore, this study used social media posts to extract information related to head-on and run-off roadway (ROR) crashes that occurred between 2010 and 2020. A total of 661 crashes were collected, which included 409 head-on and 252 ROR crashes. Geographical Information System (GIS) applications and multinomial logit models were developed to understand the spatial distribution of crashes and the resulting severity. It was found that the spatial distribution of crashes differs significantly by type and severity. Head-on collisions were predominant in two eastern regions, while ROR collisions appeared to spread on a large scale across the entire country. The pattern of fatal collis...
ITE 2009 Annual Meeting and ExhibitInstitute of Transportation Engineers (ITE), 2009
The Transportation Research Forum, founded in 1958, is an independent, nonprofit organization of ... more The Transportation Research Forum, founded in 1958, is an independent, nonprofit organization of transportation professionals who conduct, use, and benefit from research. Its purpose is to provide an impartial meeting ground for carriers, shippers, government officials, consultants, university researchers, suppliers, and others seeking exchange of information and ideas related to both passenger and freight transportation. More information on the Transportation Research Forum can be found on the Web at www.trforum.org.
Special thanks to the Florida Department of Transportation (FDOT) for supporting this study. The ... more Special thanks to the Florida Department of Transportation (FDOT) for supporting this study. The study"s success depended heavily on their funding. Many thanks should go to MaryAnne Koos of Road Design Department whom I worked with closely to get all necessary information from different districts bike coordinators. I am also sincerely grateful to my friends Hung Hoang
Journal of Water, Sanitation and Hygiene for Development, 2021
Access to safe drinking water is a challenge for students in primary and secondary schools in Tan... more Access to safe drinking water is a challenge for students in primary and secondary schools in Tanzania. Only 32.7% of primary and secondary schools in Tanzania have access to safe drinking water and the point-of-use water treatment is rarely used. The traditional water disinfection method by boiling is often limited in boarding schools due to cost and time constraints. The objectives were to assess the willingness and attitude of boarding school students toward the use of the alternative water treatment method and determine the quality of drinking water before and after the introduction of the new method. Chlorine tablets were used due to their availability, ease of use, cost, and effectiveness. Weekly evaluations on usage, performance, and acceptability of chlorine tablets were assessed on 42 randomly selected students over a 3-week period in parallel with water sampling and testing before and after using chlorine tablets. Before the introduction of chlorine, only 17% of the studen...
This study developed lane width crash modification factors (CMFs) for urban curb-and-gutter multi... more This study developed lane width crash modification factors (CMFs) for urban curb-and-gutter multilane roadways with asymmetric lanes, i.e., outside lane wider than inside lane. The roadway segments used were urban four-lane with a raised median (4D) and with a two-way left-turn lane (5T). Three crash categories were evaluated: KABCO (Fatal (K), incapacitating-injury (A), non-incapacitating injury (B), possible injury (C) and property damage only crashes (O)), KABC (Fatal (K), incapacitating-injury (A), non-incapacitating injury (B), and possible injury crashes (C)), and PDO (property damage only) crashes. A cross-sectional method was used as it was the most practical and feasible for this study. Six-year (2004 to 2009) of segment crashes were examined. The analysis involved statistical modeling using the negative binomial model, whose coefficients were used to develop multiplicative CMF equations for a combined effect of variable inside and outside lane width. In summary, the result...
Journal of the Transportation Research Forum, 2012
The safe and efficient movement of passengers to and from the high-capacity transit system to oth... more The safe and efficient movement of passengers to and from the high-capacity transit system to other modes of transportation is of paramount importance to transportation officials. Transit stations are the primary interfaces for passengers with the transit system. This paper presents a procedure which could be used to develop station design criteria and guidelines with a focus on intermodal connectivity. The proposed procedure may be used for developing station design criteria and guidelines for high-capacity transit systems including rail project and Bus Rapid Transit (BRT). A successful implementation of the transit projects will result in higher ridership rates and hence reduce dependency on automobile driving along Florida highways.
This study developed lane width crash modification factors (CMFs) for urban curb-and-gutter multi... more This study developed lane width crash modification factors (CMFs) for urban curb-and-gutter multilane roadways with asymmetric lanes, i.e., outside lane wider than inside lane. The roadway segments used were urban four-lane with a raised median (4D) and with a two-way left-turn lane (5T). Data used included 25 centerline miles of 5T segments and 39 centerline miles of 4D segments. Three crash categories were evaluated; KABCO { Fatal (K), incapacitating-injury (A), non-incapacitating injury (B), possible injury (C) and property damage only crashes (O)}, KABC {Fatal (K), incapacitating-injury (A), non-incapacitating injury (B), and possible injury crashes (C)}, and PDO (property damage only) crashes. A cross-sectional method was used as it was the most practical and feasible for this study. Six-year (2004 to 2009) of segment crashes were examined. The analysis involved statistical modeling using the negative binomial model, whose coefficients were used to develop multiplicative CMF eq...
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Papers by Geophrey Mbatta