I know if you put a duration rule on the alert it will over look these false alerts. Because it is likely people and vehicles don't move fast enough to get canceled. But can you add it to the cross the boundary rule. That would mean a two rule alert or even 3 rules.
rule 1 crossing boundary, rule 2 duration of 3 sec, rule 3 larger than 30 pix. in other words its all or no alert.
