Estimating Acceleration and Lane-Changing Dynamics Based on NGSIM Trajectory Data

Understand

The NGSIM trajectory data sets provide longitudinal and lateral positional information for all vehicles in certain spatiotemporal regions.

• Velocity and acceleration information cannot be extracted directly since the noise in the NGSIM positional information is greatly increased by the necessary numerical differentiations.
• We propose a smoothing algorithm for positions, velocities and accelerations that can also be applied near the boundaries.
• The smoothing time interval is estimated based on velocity time series and the variance of the processed acceleration time series.