A UWB/INS Trajectory Tracking System Application in a Cycling Safety Study.

Area of Science:

• Transportation Engineering
• Traffic Safety
• Human Factors in Mobility

Background:

• Unsignalized intersections pose safety risks to cyclists and pedestrians.
• Effective speed calming measures are crucial for mitigating accident severity.
• Accurate trajectory data is needed to evaluate safety interventions.

Purpose of the Study:

• To propose and deploy an integrated portable ultra-wideband/inertial navigation system (UWB/INS) for capturing cyclist trajectories.
• To evaluate the effectiveness of various speed calming measures at an experimental site.
• To identify the most effective geometric design for enhancing intersection safety.

Main Methods:

• Development and deployment of an open-source UWB/INS system for precise outdoor positioning.
• Implementation of an adaptive Kalman filter to enhance trajectory data quality.
• Collection and statistical analysis of cycling velocity data under different speed calming interventions.

Main Results:

• The UWB/INS system reliably extracted cycling trajectories for low-mobility objects.
• Varied speed calming measures were tested and their impact on cycling velocity analyzed.
• A novel geometric intersection design demonstrated superior effectiveness in speed reduction compared to conventional traffic signs.

Conclusions:

• The developed UWB/INS system provides reliable data for cycling safety research.
• Geometric design modifications offer a promising approach to enhance cyclist safety at unsignalized intersections.
• Further research into optimized geometric designs can significantly reduce accident risks.