Specifications

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Figure 5.4. Velocity profile of a vehicle failing to stop
As can be seen in Figure 5.5, vehicles in the far lane, traveling in the opposite direction (in the
negative direction), can also be tracked. Because the camera view does not contain the stop sign
on the right-hand side of the intersection, only acceleration away from the intersection is tracked.
Figure 5.5. Velocity profile of a vehicle in the far lane
Figure 5.6 shows a histogram of average velocities for all objects tracked across the entire frame
in a single video segment. Positive velocities indicate travel from the left to the right side of the
frame (i.e., in the direction of the lane of interest). Object tracks with average velocities between
-5 and 5 miles per hour are likely to be pedestrians or cyclists. Object tracks with large negative
average velocities are vehicles traveling in the far lane. Object tracks with large positive average
velocities are vehicles traveling in the lane of interest. Note that vehicles in the lane of interest
tend to be traveling slower than the vehicles in the far lane, indicating that the vehicles are, at a
minimum, slowing as they approach the stop sign.