Electric vehicles are said to be more environmentally friendly, but with no sound, it can also be dangerous.
Company says that their driver-partners are still in the process of complying with government regulations.
Amendment allows for rear windows and windscreen to be darker than current regs.
New 80kph limit is unpopular, but hoped to lower auto accident fatalities on two-lane roads without guard rails.
MIROS analysis on fatal road accidents was basis of decision.