people going from left to right: Do you mean entering from left of the frame and leaving to the right of frame or do you mean instantaeneous direction left to right at any point?
people going from right to left: Same question as above.
people going from left to right: Do you mean entering from left of the frame and leaving to the right of frame or do you mean instantaeneous direction left to right at any point?
people going from right to left: Same question as above.