Citationjet (C525/C526) - CJ I / II / III / IV
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 120; Flight Crew Total 9000; Flight Crew Type 150
Confusion; Situational Awareness
ATC Issue All Types; Ground Excursion Runway
Flight Crew Took Evasive Action
Airport; Human Factors; Procedure
Visual Approach to SFO Runway 28R.  Following a 757; Wake avoidance procedures were followed (Wind was quartering; risk of wake was high.)  Normal touchdown; tower instructed to exit at Taxiway D.  Upon reaching D; we found D to be blocked by 3 barricades.  Taxiway D was NOT NOTAM'd closed.  Next Taxiway K was blocked by a 747 in tow.  Radio frequemcy extremely congested.  Multiple attempts made to contact tower.  A 737 was on a very short final behind us (Less than 200 ft.)  There was no time to get down to the next open taxiway.  I elected to taxi over the green (grass) painted area of airport surface to avoid the barricades and get off the runway.  No further incident or communication made with Tower or Ground.
CE525 Captain is cleared to exit Runway 28R at Taxiway D and discovered it to be barricaded and the next taxiway is blocked by another aircraft under tow.  With landing traffic on short final; the Captain elects to depart the runway between taxiways which is paved but painted green.