The Gambia is the smallest country in mainland Africa. Along with the rapid urbanization rate, motorization has increased rapidly as well, contributing to an increased number of road traffic crashes. Road traffic crashes are the 4th leading cause of in-patient deaths in adults in the Gambia and currently are a significant public health problem. This study utilized the Gambia Traffic Force’s data registry to become the first epidemiological study on road traffic injuries in the Gambia as well as the first to analyze the Gambia’s traffic data registry on a national level. Reported crashes from October 1st, 2014 to June 30, 2015 were converted from the paper-based data registry into an electronic database and analyzed statistically, and the location data were geocoded and plotted on the Gambian map. The results of this study showed that crashes involving pedestrian victims and crashes that occurred on unpaved roads were more likely to be associated with outcomes that were fatal or serious. When multiple vehicles were involved in a crash, the involvement of motorcycles and bicycles were more likely to lead to a fatal or serious injury. The mapped data showed that towards the center of each district, the number of crashes increased as pedestrian and vehicle density increased, but that injury severity outcomes were generally minor or none. In contrast, as pedestrian and vehicle density decreased, crash frequency decreased as well, but injury outcomes were more likely to be severe or fatal. The findings of the study also helped in identifying areas in policy and education that need improvement.

Road traffic injuries (RTI) currently rank as the 11th leading cause of death world wide and the leading cause of injury related deaths worldwide. Globally, road traffic crashes kill over 1.2 million people per year with over 90% of the deaths occurring in low and middle income countries. Pedestrians, cyclists, and motorcyclists, collectively called vulnerable road users, are often times the victims. Therefore, the purpose of this study was to identify the factors that are associated with traffic fatalities as well as the factors that are associated with being a vulnerable road user in traffic injuries and traffic fatalities in Pasto, Colombia. The results from this study showed that males had increased odds of being involved in a traffic fatality (OR=2.16 95%;CI 1.03-4.53). Rural road users are more likely to be involved in fatal traffic crashes than their urban counterparts (OR=5.92 95%;CI 3.00-11.71) Other groups such as young adults, vulnerable road users, and those not using safety equipment were also more likely to be injured or die in a traffic crash. Interventions specifically targeting these groups are needed.

Road safety is one of the most important problems in our society. It causes hundreds of fatalities every year worldwide. A road accident may be caused by several concurrent factors. The most common are human and infrastructure. Their interaction is important too, which has been studied in-depth for years. Therefore, there is a better knowledge about the driving task. In several cases, these advances are still not included in road guidelines. Some of these advances are centered on explaining the underlying cognitive processes of the driving task. Some others are related to the analysis of drivers’ response or a better estimation of road crashes. The concept of design consistency is related to all of them. Road design consistency is the way how road alignment fits drivers’ expectancies. Hence, drivers are surprised at inconsistent roads, presenting a higher crash risk potential. This PhD presents a new, operating speed-based global consistency model. It is based on the analysis of more than 150 two-lane rural homogeneous road segments of the Valencian Region (Spain). The final consistency parameter was selected as the combination of operational parameters that best estimated the number of crashes. Several innovative auxiliary tools were developed for this process. One example is a new tool for recreating the horizontal alignment of two-lane rural roads by means of an analytic-heuristic process. A new procedure for determining road homogeneous segments was also developed, as well as some expressions to accurately determine the most adequate design speed. The consistency model can be integrated into safety performance functions in order to estimate the amount of road crashes. Finally, all innovations are combined into a new road design methodology. This methodology aims to complement the existing guidelines, providing to road safety a continuum approach and giving the engineers tools to estimate how safe are their road designs. / Camacho Torregrosa, FJ. (2015). DEVELOPMENT AND CALIBRATION OF A GLOBAL GEOMETRIC DESIGN CONSISTENCY MODEL FOR TWO-LANE RURAL HIGHWAYS, BASED ON THE USE OF CONTINUOUS OPERATING SPEED PROFILES [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/48543 / TESIS