v. dannon showed that spherical curves in e4 can be given by frenet-like equations, and he thengave an integral characterization for spherical curves in e4 . in this paper, lorentzian spherical timelike andspacelike curves in the space time 41 r are shown to be given by frenet-like equations of timelike andspacelike curves in the euclidean space e3 and the minkowski 3-space 31 r . thus, finding...

Based on a previous risk calculation study conducted along road corridor, is recalculated using stochastic simulation by introducing variability into most of the parameters in equation. This leads to an exceedance curve comparable those catastrophe models. approach introduces uncertainty simple way, and it can be used for poorly documented cases compensate lack data. tends minimize or question ...

The Newell Highway is the longest highway in NSW, stretching over 1,000 kilometres from the Victorian border to the Queensland border. It is a major freight route from Melbourne to Brisbane, as well as being popular with interstate travellers and tourists. This route was reviewed using a multi-disciplinary method developed by the NSW Centre for Road Safety based on Safe System principles. The r...

In order to reduce the influence of unreasonable road alignment design on vehicle driving safety, a study optimization and safety based two-dimensional point collision dynamics was carried out. First, through model, relationship kinematic parameters before after deduced. Second, according vehicle–road coupling dynamic model analysis collision, threshold between radius circular curve superelevat...

Aiming at complex road conditions and difficult path planning of semi-structured roads in a park, robust method based on sequential quadratic programming (SQP) algorithm optimization is proposed. Firstly, an improved vector field histogram (VFH) used to determine the optimal passable area, then determination target state given area; Secondly, according starting point state, description obstacle...

OBJECTIVE Disability has been identified as a core outcome measure in rheumatoid arthritis (RA). The aim of this study was to test the Recent-Onset Arthritis Disability (ROAD) questionnaire for validity, reliability and responsiveness in Italian patients with early RA. METHODS The psychometric properties of ROAD were tested in 159 patients with early RA, mean age 54.7 (+/- 8.8), 74.3% women, ...

Road safety index is an important indicator that has been recently introduced as a useful tool to measure the quality of life in many countries and cities. Road safety index is a complex index and it has at least three main components, including road user behavior, vehicle safety, and road infrastructure effects. Many researchers have selected studying road performance from road safety index pe...

This paper describes an attempt to shed some light on road safety in Asia Pacific region by characterizing and assessing its road accidents. The relevant national road accident data were extracted from centralized data sources of international agencies. Due to data incompleteness and missing values, 21 Asia Pacific countries, presenting more than half of the world’s population, were selected fo...

Road authorities considering the implementation of speed management interventions should have access to the results of scientifically robust evaluations on which to base their decisions. However, studies that evaluate a diverse range of interventions with comparable metrics are rare, with most focussing on one type, for example, types of signage, perceptual countermeasures or physical traffic c...