After the time jump between season 8 and 9 all of the automobiles are abandoned or transformed into carriages; obviously because there's no more fuel and spare parts. All, except Daryl's motorbike. He rides it frequently, still, he's never seen scavenging for fuel, though he passes some abandoned cars. When the engine stops, he observes that the fuel pipe is broken, replaces the pipe, but there's no leakage, no need for refueling, everything goes on OK.
The zombie soldier crawling towards Daryl while he's fixing his bike is wearing the Shoulder Sleeve Insignia of the Virginia National Guard Joint Forces Headquarters upside down. The point of the patch actually faces up, with the flat part of the patch on the bottom.