The change in people's lifestyles, their desire or compulsion to move constantly and the development of technology, have forced communications, which has led, among other things, an intensive increase traffic. For this reason, purpose article is identify main causes traffic delays factors affecting sense safety on road. It followed by analytical part, presents effect a survey conducted group 40...

BACKGROUND Trauma registries are used to identify modifiable injury risk factors for trauma prevention efforts. However, these may miss useful of bicycle-automobile collisions, such as vehicle speeds, driver intoxication, street conditions, and neighborhood characteristics. We hypothesize that (GIS) analysis registry data matched with a traffic accident database could injuries better inform MET...

This paper demonstrates the application of full Bayes multivariate linear intervention models to evaluate the impact of the Signal Head Upgrade Program in the City of Surrey, British Columbia. The program was implemented by the Insurance Corporation of British Columbia (ICBC) and is aimed at reducing the number of collisions by improving signal visibility. Specific improvements include: upgradi...

Interference between concurrent transmissions causes severe performance degradation in a wireless network. This paper addresses interference cancellation to enable simultaneous packet receptions at a node with a single radio in Wireless Sensor Networks (WSN). Interference cancellation is particularly important for WSN as most of its applications rely on convergecast where all the traffic in the...

BACKGROUND Evidence related to the effectiveness of speed humps on reducing pedestrian-motor vehicle collisions (PMVC) has been conflicting. The purpose of this study was to determine the association between speed hump installation and changes in PMVC rates in Toronto, Canada. METHODS Speed humps were mapped along with police-reported pedestrian collisions from 2000-2011 and built environment...

BACKGROUND Free-flying insectivorous bats occasionally collide with stationary objects they should easily detect by echolocation and avoid. Collisions often occur with lighted objects, suggesting ambient light may deleteriously affect obstacle avoidance capabilities. We tested the hypothesis that free-flying bats may orient by vision when they collide with some obstacles. We additionally tested...

The Empirical Bayesian (EB) Method, currently the industry standard for before-andafter collision analysis, was used to perform tests on the efficacy of high-visibility school (yellow, continental-style) crosswalks in the City of San Francisco. Statistical analysis compared the number of collisions predicted for the after period had the enhanced crosswalks not been installed to the number of co...

The current air traffic management systems are not able to manage the enormous capacities of air traffic perfectly and have not sufficient capability to service different types of flights. Free flight is a new concept presented potentially to solve problems in the current air traffic management system. The free flight concept changes the current centralized and command-control airspace system (...

IEEE 802.11 is the most famous protocol for implementation of wireless local area network (WLAN). To access the medium, IEEE 802.11 uses carrier sense multiple access with collision avoidance (CSMA/CA) mechanism, called distributed coordination function (DCF). Although DCF uses binary exponential backoff (BEB) algorithm to avoid frame collisions, wireless resources are wasted due to a lot of co...