IN A 3 MIN PERIOD; AN ORD ATCT LCL CTLR HAS 2 GARS DUE TO RWY INCURSIONS BY VEHICLES IN 2 SEPARATE INSTANCES.

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TFC WAS LNDG ON RWY 32L. THERE WERE NUMEROUS CITY CONSTRUCTION VEHICLES WORKING AROUND THE RWY AND THEY HAD BEEN THERE FOR AT LEAST AN HR BEFORE THE EVENT OCCURRED. THERE WERE BARRICADES ON BOTH SIDES OF THE RWY; SO AS TO PREVENT ANY CONSTRUCTION VEHICLES FROM ENTERING OR XING RWY 32L. AS ACR X (DC9) WAS JUST ABOUT TO TOUCH DOWN; THE PLT INITIATED A GAR ON HIS OWN. A SPLIT SECOND LATER THE AMASS ALARMED SIGNIFYING TFC ON THE RWY AND ISSUED GAR INSTRUCTIONS AS WELL. ONCE THE AMASS ALARM HAD CEASED. I ISSUED GAR INSTRUCTIONS INCLUDING A HDG AND ALT BECAUSE IT'S VERY HARD TO TALK OVER THE VERY LOUD AMASS SPEAKERS. AS ACR X WAS GOING AROUND; I NOTICED A CITY VEHICLE LEAVING THE RWY AT THE INTXN OF RWY 32L AND RWY 27L. I CONTACTED (VIA RADIO) THE CITY CONSTRUCTION COORDINATOR WHO WAS WORKING IN THE AREA OF THE CONSTRUCTION AND HE WAS ABLE TO STOP THE VEHICLE THAT HAD JUST ENTERED AND EXITED THE RWY WITHOUT A CLRNC AND ESCORTED THE DRIVER TO A SECURE AREA. 3 MINS LATER; ACR Y (B747-400) WAS JUST ABOUT TO TOUCH DOWN ON THE SAME RWY AND ANOTHER; DIFFERENT; CITY CONSTRUCTION VEHICLE ENTERED THE RWY AND CAUSED THE ARR TO GO AROUND. THE AMASS AGAIN ALARMED AFTER THE PLT HAD ALREADY INITIATED THE GAR. A SECOND CITY CONSTRUCTION COORDINATING VEHICLE WAS ABLE TO STOP THIS SECOND VEHICLE THAT INTRUDED ON THE RWY AND WAS ABLE TO SECURE THIS DRIVER AS WELL. AS THE SECOND VEHICLE WAS BEING STOPPED; IT AGAIN DROVE PAST THE RWY HOLD BARS AND STOPPED JUST SHORT OF THE RWY EDGE LINE. TFC WAS ON SHORT FINAL AND I WAS ABOUT TO SEND THAT TFC AROUND AS WELL; BUT THE VEHICLE THEN BACKED AWAY FROM THE RWY.