D.C. Mun. Regs. tit. 18, § 2432
2432.1 The residential permit parking (“RPP”) program is established to restrict parking on designated blocks in the District as follows:
(a) Parking on a block may be restricted so that only motor vehicles registered to residents who live in the applicable RPP parking zone may be parked on the block; provided that motor vehicles not registered to residents who live in the applicable RPP parking zone may be parked on the block for up to two (2) hours; and
(b) Parking on a block may be restricted so that only motor vehicles registered to residents who live in the applicable RPP parking zone, or motor vehicles with annual visitor parking passes or temporary visitor parking permits as established in § 2414 of this title, may be parked on the block.
SOURCE: Final Rulemaking published at 66 DCR 10565 (August 16, 2019).