The SFMTA has stopped metro service tonight as of 6:31 pm. and bus shuttles are servicing the metro lines. The official tweet:
ATTN: due to signal issues Metro service has been stopped. Bus shuttles to service the Metro Lines.
— SFMTA (@sfmta_muni) December 4, 2012
The signal issues appears to be at outbound Duboce and inbound Embarcadero, according to the SFMTA. We’ll keep you posted.