Or even easier, simply drive in the middle lane while adjacent to another vehicle to block the camera's view of your plate. Flock's cameras mount in the center median or sidewalk and are only capable of reading plates from the two nearest lanes of traffic. There are better solutions out there which mount onto traffic signal poles and monitor each lane from above, making it much more difficult to circumvent (intentionally or by happenstance).

Of course this isn't much of a concern when installed onto a two-lane residential street for targeted enforcement. Though I know most municipalities opt to only place cameras at points of egress/ingress on their borders with other cities, and those roads tend to be more than just two lanes.