Hi,
From the opposite direction of the restriction I added there is an OpenStreetCam trip where you can see a straight on for buses and taxis lane.
Also, in OSC and Mapillary Images there is a trip on Cesar Chavez Street where the only right sign (except for buses and taxis) can be seen. I am sorry that I missed to include Mapillary Images in the sources as well.
Regards,
Daniela