Check the model of collision of buses or other vehicles.
Check the maximum speed (My record is 211кмч)
Check the hanger, etc.
Check the power of the engine thrust on the road with a slope (of 2.5%, 5%, 7.5%, 10%, 12.5%, 15%.).
Kill the bus in the trash and other hidden features of the card
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Quote from Current map version - v 2.0