There is no "formal" corridor through the "TCA" which we have referred to as "Class B" airspace for over ten years now. This route is inside the inner 7NM core airspace of SFO. It's not like LAX which has a formal VFR corridor along the coast.
This is a VFR route that has developed and been accepted by the SFO controllers and local GA operators as a shortcut from the City of San Francisco to the GA airports southwest of SFO. In order to enter the airspace, the GA aircraft accepts a discrete Transponder code, and must read back the clearance.
Depending on traffic and WX conditions, clearance is either grated or denied. Those of us who use this corridor accept these "rules".
When departing San Carlos Airport, a clearance can be obtained from Ground Control.
Denial of clearance means a detour to the coastline and, if you want to remain within gliding distance of the coastline, a descent to 700 ft. for about 5 miles. Not an awful detour, the view is beautiful.
As I said earlier, conditions change and SFO tower will change the clearance as they require.
I have to say that the controllers at SFO are some of the sharpest and most professional that I have ever run across.
Thread drift ahead!
I was shooting an aerial photo job in the Oyster Point area (in the SFO inner core) one day last year, I had co-ordinated the job with a phone call to SFO Tower. Traffic out of SFO was light, and the controller, who had been watching me work, asked if I would fly by the tower so he could take a closer look at my Helio Courier which is a rather unusual airplane. Here's a bit about the airplane -- Handley-Page leading edge slats, slotted Fowler Flaps and a very large wing:
Chamois Moon - Helio Courier