Referencing speed states

Is there somewhere I can reference this apart from the game-config.json file or would I need to declare this myself into the code?

“MINIMUM_SPEED”: 0,

"SPEED_STATE_1": 3,

"INITIAL_SPEED": 5,

"SPEED_STATE_2": 6,

"SPEED_STATE_3": 8,

"MAXIMUM_SPEED": 9, 

"BOOST_SPEED": 15,