The arrows mark the direction of the trolley's route, and are color-coded to mark each section of the trolley's route, from blue to yellow, yellow to red, and red to blue. For instance, the arrows turn red once the trolley has reached the Red Lot, and remain red until it reaches the Blue Lot, at which point they turn blue.
If you see an icon with a trolley marker at the top, that means that unit is chartered currently. Charters are reserved for a private party and are not available to the general public.
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For more information about the trolley, click here.