What's closed, open on Martin Luther King Day

Holiday observed: Today.

Retail stores: Open at owner's discretion.

Liquor stores: Open.

Supermarkets: Open.

Convenience stores: Open.

Taverns, bars: Open.

Banks: Closed.

Stock market: Closed.

Municipal, state, federal offices: Closed.

Libraries: Closed.

Schools: Closed.

Mail: Post offices closed; express delivery only.

MBTA: Buses, subway, and trackless trolleys on Saturday schedule. Commuter rail and commuter boats from Hingham, Hull, and Quincy on weekday schedule, along with inner-harbor ferry from Charlestown to Long Wharf. The RIDE will operate on a weekday schedule. For more information, call (617) 222-3200.

Boston traffic rules: Meters not in effect. All other parking rules apply.

Trash/recycling collection: No collection, except in Boston proper and Roxbury; all other districts deferred one day, except no delay in South Boston and Charlestown.