What if the manufacturer does not have room for a cancel button or does not want to radically change the switch design?
A manufacturer can in most cases modify existing switch assembly levers to restrict lever travel and make a left and right momentary switch design. In that case, to cancel the turn signal, the opposite direction is selected. For instance, if the right turn signal is on and the driver wishes to cancel the turn signal, then the left position is selected and the right turn signal is turned off. This method actually reduces costs.