A drivers advocacy group and two lawmakers are calling for Maryland officials to tighten a loophole on speed cameras they say allows police departments and a private contractor to operate a bounty system that earns money on each ticket.

Chevy Chase Village, for example, brings in more than $1.2 million annually from its speed cameras, more than the police department’s $1 million budget. About 40 percent, or $16.25 of each $40 ticket, goes to the private company that owns the cameras.