Meters are color-coded and good only for the time period specified. Customers sometimes continue to add money to a meter which is prohibited if the car has been parked at a colored meter area for more than the permitted meter duration time. For instance, a yellow meter means a car may only park at a yellow meter in an area for a maximum of 20 minutes. Adding money or moving the vehicle to another yellow meter is invalid and subject to a ticket. Please contact Parking Citation Services at 240.453.0113 if a ticket was issued at a broken meter.