Johnson, in an interview Wednesday, said a review of the original 15 cameras, installed just over a year ago, was recently completed.
"I've been looking at the current 15 camera sites and I'm making recommendations as to whether or not some of the cameras should be moved to other locations," Johnson said, adding that "there are a few sites that could be changed."
Johnson declined to say how many cameras could be moved as a result of what he called "a lengthy analysis."
The cameras issue $40 tickets to drivers caught exceeding the speed limit in school zones by more than 12 mph.
Johnson has previously told county officials that in changing the habits of speeding drivers.
A list of potential new sites has been sent to the administration for approval, Johnson said. He declined to say what school zones have been recommended.
In February, the County Council approved a law allowing the county to in school zones around the county. The original bill, passed in 2010, limited the county to just 15 speed cameras.
The county has, however, faced budgetary challenges because of the economic downturn. Earlier this year, county officials told members of the county's General Assembly delegation that it had , despite the change in the law.
CORRECTION: An earlier edition of this article incorrectly stated the speed that must be exceeded in order for the camera to issue a ticket.