RWY INCURSION BY AN ARPT SECURITY MAINT VEHICLE AT VNY; CA.

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VNY ATCT; ARPT MGMNT AND LAFD WERE ALERTED TO ANY EMER ACFT INBOUND TO THE ARPT. THIS ACFT ARRIVED VNY LNDG ON RWY 16R (PRIMARY RWY). THE NATURE OF THE EMER PRODUCED BLOWOUTS TO THE MAIN LNDG GEAR TIRES. CONSEQUENTLY; DEBRIS FROM THE ACFT WAS LEFT ALONG THE GND TRACK FROM THE LNDG ROLLOUT. RWY 16R WAS CLOSED IMMEDIATELY AND RESCUE CREWS PROCEEDED TO THE DISABLED ACFT AT THE FAR END OF THE RWY. THERE WERE NO INJURIES. AS PART OF MY DUTIES IN MANAGING ARPT AND ACFT EMERS; I WAS INSTRUCTED BY MY SUPVR TO INSPECT THE ENTIRE RWY FOR FOREIGN OBJECT DAMAGE AND DISPATCH AIRFIELD MAINT CREWS FOR CLEAN UP. WHILE CARRYING OUT THIS INSTRUCTION I WAS ADVISED BY COMPANY RADIO OF A SEPARATE ISSUE THAT NEEDED ATTN ON THE E SIDE OF THE AIRFIELD AT AN FBO. I ACKNOWLEDGED THE XMISSION. DURING MY RESPONSE TO THIS SEPARATE INCIDENT; AT INTXN 10F; I CROSSED THE HOLD BAR FOR RWY 16R AND WITHOUT CLRNC CROSSED THE HOLD BAR FOR RWY 16L (ADJACENT PARALLEL RWY). I DID NOT CROSS THE EDGE-LINE FOR RWY 16L. REALIZING THE ERROR THAT WAS MADE; I STOPPED; TURNED AROUND AND PROCEEDED BACK TO THE HOLDING SIDE OF RWY 16L. A LNDG CESSNA 172 WAS LNDG ON RWY 16L WHEN THE INCIDENT OCCURRED. AS FAR AS I KNOW; THE CESSNA DID NOT ALTER ITS PATH DUE TO MY ENCROACHMENT. AFTER A FEW MOMENTS; I RADIOED VNY GND CTL FOR THE CLRNC TO CROSS THE L RWY. CLRNC WAS GIVEN AND I PROCEEDED TO MY DEST. IN MY OPINION; THE CONTRIBUTING FACTOR MOST AFFECTING THIS OCCURRENCE WOULD BE DISTR. THIS WAS CREATED BY FREQUENT OUTSIDE RADIO XMISSIONS (VHF AND UHF); THE EXPEDITIOUS NATURE OF EMER RESPONSE AND THE INTENSITY OF HANDLING A PIVOTAL SIT. THIS DISTR LEAD TO MY BELIEF THAT MY LOCATION ON RWY 16R WAS S OF WHERE I ACTUALLY WAS. (RWY 16L ENDS MIDFIELD AND MY XING TO THE E AT A MORE SOUTHERN POINT WOULD NEGATE MY XING OF THIS RWY.) I HAVE RESPONDED TO NUMEROUS ACFT ALERTS; INCIDENTS AND ACCIDENTS PRIOR TO THIS AND HAVE ALWAYS BEEN DILIGENT IN THE RESPONSIBILITY OF OPERATING A VEHICLE ON AN ACFT MOVEMENT AREA. I DO NOT FEEL THAT I WAS OVERWHELMED IN THIS SIT MORE SO THAN OTHERS. I'VE HANDLED WORSE. IN THIS CASE IT IS SIMPLE -- I WAS NOT PAYING CLOSE ENOUGH ATTN TO OPERATING MY VEHICLE (SITUATIONAL AWARENESS).