BARS Cars represents a Route List and it's components...
The cars are the calls
The guards are verifying the FRL is met before cars enter the "ENTR".
The "dead" looking cars before the first sign did not meet the required NCOS-FRL
The exits/turns are the Trunk Routes leading to the carrier
The DMI guy near the red "DMI pump", places the digits on the car before it is released to the carrier.