Various forms of technology are used to charge motorists for the use of a parking lot. Boom gates are used in many parking lots. A customer arrives to the entry ticket machine by vehicle, presses the ticket request push button, takes a ticket and enters the car park via the now raised barrier. To exit the parking lot, the customer presents the ticket to a cashier in a booth at the exit and tenders payment, after which the cashier opens the boom gate. This is used in the vast majority of Airport Parking with BCP.
A more modern system users automatic pay stations, where the driver presents the ticket and pays the fee required before returning to their car, then drives to the exit terminal and presents the ticket. If the ticket has not been paid for, the boom barrier will not raise and will force the customer to either press the intercom and speak to a staff member, or reverse out to pay at the pay station or cashier booth. Another variant of payment has motorists paying an attendant on entry to the lot, with the way out guarded by a one-way spike strip that will only allow cars to exit. More information visit Cardiff Airport
Parking meters can also be used, with motorists paying for the time required for the bay they are parked in. Other parking lots operate on a pay and display system, where a ticket is purchased from a ticket machine, and then placed on the dashboard of the car. Parking enforcement officers patrol the parking lot to ensure compliance with the requirement. In the United Kingdom it has been possible to pre-book parking with specialist companies, such as NCP, since 1978. This is prevalent at all airports, major ports and in city centres.