Postby kenwstr » Fri Nov 17, 2017 7:51 am
Having seen many videos with calibration lines, if the tyres cross the lower edge of the frame, the motor vehicle is too close. In this case though, the camera appears to be off axis, that is not aligned with the bikes centre line. The lens axis is angled across the road somewhat. If you set some measured out tapes on the ground and photograph that with the camera in the exact same alignment, you will have some calibration marks to put over the image. Best is if you do a grid so you have both side clearance and fore/aft distances. That way you can clearly show the angle the car is travelling and whether it will obtains 1.5 m by the time it pass you. In this case though, it seems pretty clear to me that it didn't. I have to assume the cop just doesn't want to be bothered with it.
In any case, it's still an illegal overtake as the car is sharing the same lane with you.
If you project the centre line of the road and the track of the car tyres, I suspect these lines will show there is no way the car could possibly have changed into the overtaking lane.
You can also scale across the lane, parallel with the lower edge of the frame. Compare this with a measurement of the lane width will give you the distance from the car to the lane edge. It is then simple maths to calculate the maximum possible clearance from the bike if you assume the bike is more left than it obviously is just to make the point. It is difficult to get the true position of the bike as it is not on the lens axis.
Ken