New rules take effect Monday for paying fees at Metro's parking facilities. These are the basics:

Q: Can I pay for parking with cash or credit?

A: No. Starting Monday, customers must pay with SmarTrip cards.

Q: What is a SmarTrip card?

A: A reusable, prepaid card that can be used to pay for parking at Metro lots and fares for all Metrorail and some Metrobus trips.

Q: Where can I buy SmarTrip cards?

A: At SmarTrip vending machines in Metro stations with parking facilities, at Metro sales offices, online, by mail and at some Giant supermarkets.

Q: How much do SmarTrip cards cost?

A:$5 each. Customers can add up to $200 in value to each card.

Q: What are the hours during which parking fees will be collected?

A: Monday to Thursday, 9 a.m. to midnight. Friday, 9 a.m. to 3 a.m. Saturday. At a few stations, drivers will continue to be charged on entry rather than exit. Parking is free on weekends and most holidays.

Q: What if a parking lot is full?

A: A customer service representative will close it.

Q: Will I have to pay to use the Kiss & Ride lot?

A: No. Kiss & Ride lots remain free of charge. The 3,400 metered parking spaces at Metro parking facilities will also remain.

Q: What if I reach the booth to exit but don't have a SmarTrip card or enough money to buy one?

A: There will be a grace period during which Metro will allow commuters without SmarTrip cards to leave. But if the behavior continues, Metro will write down license plate numbers, send collection notices and eventually seek police help.