Too Many Doorbell Motion Alerts

I live on a busy street so I adjusted the motion range to detect right at foot of the first porch step. I also set the alerts to "light" and I'm still getting alerts all night and all day. There are no other moving objects that would trigger the alert. I've continuously played around with the range, bringing it to the absolute minimum and still no change. It's incredibly frustrating tuning in to a bunch of false alarms. Has anyone suffered this issue and found a fix?