Towards a ground navigation system based in visual feedback provided by a mini UAV

This paper addresses initial efforts to develop a navigation system for ground vehicles supported by visual feedback from a mini aerial vehicle. A visual-based algorithm computes the ground vehicle pose in the world frame, as well as possible obstacles within the ground vehicle pathway. Relying on that information, a navigation and obstacle avoidance system is used to re-plan the ground vehicle trajectory, ensuring an optimal detour. Finally, some experiments are presented employing a unmanned ground vehicle (UGV) and a low cost mini unmanned aerial vehicle (UAV).

Sight distance for traffic safety analysis using GIS

Sight distance is of major importance for road safety either when designing new roads or analysing the alignment of existing roads. It is essential that available sight distance in roads is long enough for emergency stops or overtaking manoeuvres. Also, it is vital for engineers/researchers that the tools used for that analysis are both powerful and intuitive. Based on ArcGIS, the application to be presented not only performs an exhaustive sight distance calculation, but allows an accurate analysis of 3D alignment, using all new tools, from a Digital Elevation Model and vehicle trajectory. The software has been successfully utilised to analyse several two-lane rural roads in Spain. In addition, the software produces thematic maps representing sight distance in which supplementary information about crashes, traffic flow, speed or design consistency could be included, allowing traffic safety studies.

On ergodic least-squares estimators of the generalized diffusion coefficient for fractional Brownian motion

We analyse a class of estimators of the generalized diffusion coefficient for fractional Brownian motion Bt of known Hurst index H, based on weighted functionals of the single time square displacement. We show that for a certain choice of the weight function these functionals possess an ergodic property and thus provide the true, ensemble-averaged, generalized diffusion coefficient to any necessary precision from a single trajectory data, but at expense of a progressively higher experimental resolution. Convergence is fastest around H ? 0.30, a value in the subdiffusive regime.

Safety aspects of roadside cross-section design. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Bridge rail to restrain and redirect buses.

Texas State Department of Highways and Public Transportation, Transportation Planning Division, Austin

National Crash Severity Study - quality control. Task V: analysis to refine spinout aspects of CRASH. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Accident investigation studies - staged rear impact collisions. Final report.

Mode of access: Internet.

Evaluation of design analysis procedures and acceptance criteria for roadside hardware. Volume V - hazards of the redirected car. Final report.

Federal Highway Administration, Safety Design Division, McLean, Va.

Movable concrete median barrier: risk analysis of deflection into opposing traffic.

Federal Highway Administration, Office of Research, Development, and Technology, Washington, D.C.

Mathematical reconstruction of highway accidents - further extensions and refinements of the CRASH computer program. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Van crashworthiness and aggressivity study, test report 3: accident investigation studies. Final report.

National Highway Traffic Safety Administration, Washington, D.C.