S.D. Codified Laws § 32-32-16
Deadline for equipping bus with stop arm signal
Any school bus purchased or in operation before September 1, 1992, shall be equipped with a stop arm signal by September 1, 1999. Any school bus equipped with a stop arm signal shall comply with the provisions of § 32-32-5.2 .
Source: SL 1992, ch 230, § 5.