PA34 PLT EXITING THE RWY MISSED HIS ASSIGNED TXWY AND TAXIED ONTO THE GRASS.

Narrative

AFTER LNDG ON RWY 28L AT LAN I MISSED THE TXWY TURNOFF AND TAXIED INTO THE GRASS ON THE S SIDE OF THE RWY. THIS CAUSED AN ACR TO GO AROUND. NO DAMAGE WAS DONE TO MY PLANE. I TRIED TO TURN OFF ON TXWY M BUT GOT CONFUSED BY THE BLUE LIGHTS AND TURNED OFF BTWN TXWY D AND M; ONTO THE GRASS. I SHOULD HAVE NOTICED THERE WAS NO YELLOW LEAD-IN LINE TO A TXWY AT THAT POINT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE PLT STATED THAT THERE WERE NO CONSEQUENCES TO HIS RWY EXCURSION EXCEPT FOR MAKING AN ACR GO AROUND AS HE TAXIED BACK ONTO THE RWY. HE SAID CTLRS DIDN'T REACT OR RESPOND TO HIS EVENT. WHEN I ASKED HIM IF THERE WAS ANY KIND OF FAA INVESTIGATION; HE SAID NO BUT THE ARPT POLICE CAME TO HIS ACFT; INSPECTED IT FOR DAMAGE AND QUESTIONED HIM ABOUT HIS SOBRIETY AND WELL-BEING. HE COULD NOT GET A CLRNC BACK TO HIS HOME BASE UNTIL THE POLICE COMPLETED THEIR INSPECTION AND QUESITONING. THE ARPT MAINT CREW ALSO INSPECTED THE RWY FOR POSSIBLE ACFT PARTS. HE HAS NOT HEARD FROM THE FAA OR ANY AUTHS ABOUT THIS INCIDENT.