Narrative:

Preliminary vehicle deviation; resulted in a loss of separation. The airport surface surveillance capability (assc) replay revealed a vehicle originating from the [ramp] hangar proceeded eastbound on taxiway C; holding west of runway 01L while aircraft X was on departure roll on runway 01L. The vehicle entered runway 19R southbound and proceeded along the west edge of runway 19R after aircraft X flew past taxiway C. The vehicle then crossed runway 28R at runway 19R. The assc alerted when the vehicle proceeded southbound across runway 28R and turning parallel to runway 28R after aircraft X touched down and rolled out on runway 28R. The vehicle turned right (westbound) along the south edge of runway 28R between taxiways echo and delta and aircraft X rolled out past the vehicle. The vehicle stopped in runway safety area between runway 28R and taxiway east. The driver turned on their hazard lights; then pulled up and stopped between runways 28R/left at taxiway echo for a minute. Aircraft Y next landed on runway 28L and the vehicle proceeded across runway 28L at intersection echo after aircraft Y rolled out past taxiway echo.I was the front line manager on duty. Tower personnel were first alerted to this incident by the assc alerting. The local controller and I looked at the two targets highlighted by assc. I observed the vehicle and aircraft X in alert status. The vehicle appeared to proceed along the south edge of the runway 28R as aircraft X was rolling out on runway 28R; crossing runways 01. The vehicle was an unmarked white van; and the controller nor I thought anything was suspicious yet. I called airport operations to dispatch [the airport vehicle] to the location of the white van to talk to the driver. At first I thought the alert was a nuisance alert; because we do have vehicles operating on the airfield doing various tasks. Once the vehicle was observed crossing on their own after aircraft Y rolling out on runway 28L; it was confirmed we had a serious violator.airport operations was inspecting runway 10L and we had the operations vehicle proceed directly to the white van; which was intercepted in the vicinity of [of a nearby gate]. The driver's profession is aircraft cleaner and they had no radio on-board vehicle.I'm not sure what type training or information the driver was given; but he should have never wandered anywhere close to the movement areas. Possibly better signage posted at the [ramp] exit points warning drivers they are about to enter airport movement areas.

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Original NASA ASRS Text

Title: Two SFO Tower Controllers reported a ground conflict caused by an unauthorized vehicle driving on the runways and taxiways.

Narrative: Preliminary vehicle deviation; resulted in a loss of separation. The Airport Surface Surveillance Capability (ASSC) replay revealed a vehicle originating from the [ramp] hangar proceeded eastbound on taxiway C; holding west of runway 01L while Aircraft X was on departure roll on Runway 01L. The vehicle entered runway 19R southbound and proceeded along the west edge of runway 19R after Aircraft X flew past taxiway C. The vehicle then crossed runway 28R at runway 19R. The ASSC alerted when the vehicle proceeded southbound across runway 28R and turning parallel to runway 28R after Aircraft X touched down and rolled out on Runway 28R. The vehicle turned right (westbound) along the south edge of runway 28R between taxiways echo and delta and Aircraft X rolled out past the vehicle. The vehicle stopped in Runway Safety Area between runway 28R and taxiway E. The driver turned on their hazard lights; then pulled up and stopped between runways 28R/L at taxiway echo for a minute. Aircraft Y next landed on Runway 28L and the vehicle proceeded across runway 28L at intersection Echo after Aircraft Y rolled out past Taxiway Echo.I was the Front Line Manager on duty. Tower personnel were first alerted to this incident by the ASSC alerting. The Local Controller and I looked at the two targets highlighted by ASSC. I observed the vehicle and Aircraft X in alert status. The vehicle appeared to proceed along the south edge of the runway 28R as Aircraft X was rolling out on runway 28R; crossing runways 01. The vehicle was an unmarked white van; and the controller nor I thought anything was suspicious yet. I called Airport Operations to dispatch [the airport vehicle] to the location of the white van to talk to the driver. At first I thought the alert was a nuisance alert; because we do have vehicles operating on the airfield doing various tasks. Once the vehicle was observed crossing on their own after Aircraft Y rolling out on runway 28L; it was confirmed we had a serious violator.Airport Operations was inspecting runway 10L and we had the Operations vehicle proceed directly to the white van; which was intercepted in the vicinity of [of a nearby gate]. The driver's profession is aircraft cleaner and they had no radio on-board vehicle.I'm not sure what type training or information the driver was given; but he should have never wandered anywhere close to the movement areas. Possibly better signage posted at the [ramp] exit points warning drivers they are about to enter airport movement areas.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.