I thought I'd finished it.
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Cole next to Tar Truck
Tar Trucks were trucks filled with Black Tar, used by the Reapers for transportation across their terrority of the Neon District in Empire City.
They were essentially hijacked oil trucks filled to the brim with tar, as there were ofen drops of tar spilling out of the cargo hold as the trucks went en route.
Missions
They first appear when Cole needs to enter one of the tunnels and destroy the tar truck that is pumping tar into the water main. After that they appear in the side missions, Mobile Poison. These trucks are usually guarded by a group of reapers.
Source
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