Sequence analysis
Time-Space Diagram Tool
Plot position against time so event timing and path conflicts can be compared on one consistent timeline.
Method overview
position at time t = initial position + velocity and acceleration terms
A time-space diagram can combine video timing, measured distances, speed estimates, signal phases, and pedestrian motion while preserving the source of each interval.
Evidence to document
- A common time origin tied to the best available evidence.
- Measured paths, positions, and conflict points.
- Supported speed or acceleration intervals.
- Uncertainty ranges for observations and timing synchronization.
Limitations
A precise-looking diagram does not remove uncertainty in the source observations. Show ranges when timing or position cannot be fixed to a single value.
Record measurements, assumptions, units, rounding, and source material so another investigator can reproduce the result. See the methodology and validation center for verification policy and citation guidance.
Related tools
Video speed · Perception-reaction distance · Total stopping distance